Moss mine arizona

Moss mine arizona DEFAULT

Northern Vertex Mining (TSXV: NEE; US-OTC: NHVCF) has reported high-grade gold and silver drill results from a resource expansion drill program on the Ruth vein at its wholly owned Moss gold-silver mine in northwest Arizona, 22 km to the east of Bullhead City and a one and half hour drive south of Las Vegas, Nevada. 

Ken Berry, Northern Vertex’s president and chief executive, said the success of its current drill program supports the company’s objective to expand the Moss mine resource base. “The positive drill results achieved from the Ruth Vein and its proximity to the Moss Vein open pit makes it an important target for further testing the possibility of additional resources, pit expansion and mine life extension,” he said in a statement. 

The Ruth vein strikes subparallel to the Moss vein, dips to the north into the south-dipping Moss vein and outcrops 150 metres south of the Central pit. Although the outcrop can only be traced on surface for 170 metres along strike, scattered historic pits have exposed veining for another 320 metres to the west. Similar scattered vein exposures can be followed 220 metres to the east, giving the vein a surface expression of 710 metres, the company said. 

A north-dipping vein in the hanging wall of the Moss vein outcrops on surface, east of the current pit limit, 1 km farther east of the last indication of the Ruth vein, and extends for 250 metres. The company noted that the vein is similar to the Ruth Vein in width, texture, orientation, and position relative to the Moss vein. The area between the two veins is characterized by scattered veins and stockworks and likely correlates with the Ruth vein, the company said. 

As a result, the vein has been named the East Ruth vein.     

Highlights from drilling at the Ruth Vein include drill hole AR20-315R, which was drilled to test the intersection of the Ruth and Moss veins and intersected the Moss vein 274 metres downhole and encountered a thick zone of quartz stockwork veining between the two veins. That hole intersected 110 metres grading 0.79 gram gold per tonne and 24.41 grams silver per tonne starting from 185 metres downhole, including 15 metres grading 1.75 grams gold and 41.1 grams silver from 197 metres and 15 metres grading 1.85 grams gold and 85.1 grams silver from 275 metres. 

Processing facilities at Northern Vertex Mining’s Moss gold-silver mine in northwest Arizona. Credit: Northern Vertex Mining.

Processing facilities at Northern Vertex Mining’s Moss gold-silver mine in northwest Arizona. Credit: Northern Vertex Mining.

Drilling of the Ruth vein has focused on following up high-grade vein intercepts in the previously reporteddrill holes AR20-286R and AR20-313R and extending the Ruth vein’s strike length by 150 metres. The drilling has also confirmed the continuity of mineralization at Ruth for 650 metres and the vein remains open to the east and to the west. 

In addition to confirming the continuity of narrow high-grade gold and silver mineralization in the vein as shown by drill holes AR20-312R, which intersected 6 metres grading 5.18 grams gold and 37.4 grams silver from 96 metres, and AR20-306R, which cut 5 metres grading 5.62 grams gold and 57.6 grams silver from 90 metres, the recent drilling also discovered thick stockwork mineralization in many places surrounding the Ruth vein, the company noted. 

Hole AR20-307R returned 23 metres grading 1.11 grams gold and 14.9 grams silver from 104 metres surrounding a suspected stope mine through the vein, and hole AR20-310R, which intersected 18 metres grading 10.2 grams gold and 26.5 grams silver from 172 metres. 

Drill holes AR20-315R, AR20-314R, and AR20-313R demonstrated the continuity of gold-silver mineralization along a down-dip length of approximately 274 metres on the Ruth vein from the surface to the Moss vein intersection, the company reported.  

According to the company, modelling indicates that the intersection between the Moss vein and the Ruth vein may become shallower on strike to the east. Additional drilling is underway to target the untested intersection along strike. The discovery of thick mineralization along this extensive zone could, the company noted, lead to the future expansion of the Moss open-pit mine to depth. 

“In addition to the success of high-grade gold and silver results from the previously untested Ruth Vein, we are extremely encouraged with the widespread mineralized intercepts encountered at the Gold Bridge and the Gold Tower zones, located directly adjacent to the producing Moss open-pit mine,” Berry stated in the news release. 

The Gold Tower target, 500 metres to the west of Ruth, consists of a broad zone of stockwork veining south and west of the West pit. Recent drilling at Gold Tower, the company said, has extended the stockwork mineralization further to the south and west, with several thick zones intersected by many drill holes. 

Highlights from drilling at Gold Tower include drill Hole AR20-300R, which returned 49 metres grading 0.74 gram gold and 4.19 grams silver from 38 metres downhole, including 8 metres grading 1.36 grams gold and 5.56 grams silver from 75 metres. A second interval from that hole intersected 35 metres grading 0.59 gram gold and 11.37 grams silver from 162 metres, including 5 metres grading 2.84 grams gold and 48.73 grams silver from 192 metres. 

In addition to the stockwork mineralization, some higher-grade veins have been drilled within the stockwork at Gold Tower, such as drill hole AR20-293R, which assayed at 9 metres grading 2.4 grams gold and 2.78 grams silver from 29 metres, the company noted. 

To date, 52 holes have been completed at Moss, totalling 5,334 metres of a planned 18,288-metre drill program. 

The company is evaluating recent assay results from 15 drill holes — ten holes from the Gold Tower area and five holes from the Ruth vein area — and is also refining its mineralization models. 

Ongoing drilling at Moss consists of two reverse circulation drill rigs focussed on the expansion of the Ruth vein, step-outs to the east, and infilling on-strike and down-dip. 

The Moss open-pit mine produced a record 14,673 oz. gold-equivalent in the third quarter, up 29% over the previous quarter, and record revenue of US$27 million based on a gold price of US$1,887 per oz. and a silver price of US$25.32 per ounce.  

The Moss mine processing facility in Arizona. Credit: Northern Vertex.

The Moss mine processing facility in Arizona. Credit: Northern Vertex.

Resources at the project stand at 20.56 million tonnes in the measured and indicated category grading 0.55 gram gold and 6.78 grams silver for 360,000 contained oz. gold and 4.46 million oz. silver. Inferred resources add 11.96 million tonnes grading 0.34 gram gold and 3.59 grams silver for 129,000 oz. gold and 1.38 million oz. silver. 

A 2017 preliminary economic assessment (PEA) outlines a low-cost, open-pit mine with a ten-year mine life. The PEA estimates a US$616 million capex for the mine with a payback period of 2.2 years and all-in sustaining costs of US$662 per oz. gold. The after-tax net present value is estimated to be US$93 million at a 5% discount rate with an after-tax internal rate of return of 52.5%. 

At press time in Toronto, Northern Vertex was trading at 67¢ per share within a 52-week trading range of 15¢ and 72¢. The company has 251 million common shares outstanding for a $168.4-million market capitalization. 

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Sours: https://www.northernminer.com/fast-news/northern-vertex-extends-mineralisation-at-moss-mine-in-arizona/1003823684/

Moss Mine, Gold Road Mining District, Oatman Mining District, Black Mountains, Mohave County, Arizona, USAi

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A former Au-Ag-fluorspar occurrence/mine located in the NW¼SW¼SE¼ sec. 19, T20N, R20W, G&SRM, 6 miles NW of Oatman and 2 miles North of Silver Creek in the old San Francisco District, on private (patented) lanbd within a Bureau of Land Management administered area. Discovered in 1864. Owned by Lloyd Moss, Arizona (1974). This was the leading mine of the district. The USGS MRDS database stated accuracy for this locality is 500 meters.

MOSS MINE.

Location and history. The Moss mine is about 4 miles northwest of Gold Road and 2¼ miles west of the Moss Back mine, to the north of Silver Creek. It lies in a well-mineralized area on the southeast slope of a group of outlying hills, the Moss Hills, which trend west to a point about 1½ miles beyond the mine. This mine, the original discovery in the country here discussed, was located in 1863 or 1864 by John Moss, who found much free visible gold exposed in the croppings about where the shaft is now sunk. On this spot, from a hole about 10 feet in diameter and depth, he took out $240,000 in gold, all of which he immediately spent in development work, much of which was ill advised. Moss died later in poverty.

The rich ore was contained in reddish-brown hematite or iron stained quartz croppings, which Silliman aptly describes as having the appearance of sulphide-bearing quartz that had been roasted. Much of it was covered with flakes, incrustations, and beads of gold from the size of shot or pea to that of a hazelnut. Two tons of ore taken from the outcrop of the vein is said to have netted $114,000 in San Francisco, and the exhibition of this rich ore led many men to brave the dangers of the desert and the Indians to reach the district.

The mine was worked principally in pioneer times, at first by the Moss Brothers. After the rich find a 10-stamp mill was built on Silver Creek just below the Holmes camp, where some of the ore may still be seen. Dahlgreen Black is said to have enlisted eastern capital and operated the mine after the Moss Brothers. The property, including several patented claims, is now owned by the Gold Giant Mining and Milling Company, with headquarters at Los Angeles. Some development work was done on the property in 1906. The total production is $500,000.

Developments. The developments consist principally of a 230-foot double- compartment shaft and about 600 feet of tunnels and crosscuts. The shaft starts on the hanging-wall side of the vein and now contains some water. Much of the horizontal underground work is 8 by 10 feet or more in cross section and was done in the pioneer black-powder days at great cost.

The tunnel starts in a gulch about 100 feet south and 60 feet below the collar of the shaft, whence it extends diagonally to the northeast for a distance of about 250 feet, following a stringer in part nearly to the vein. It then parallels the vein westward as far as the shaft, with which it connects by a crosscut. Other crosscuts open the vein at intervals and extend into the foot wall on the north. Several shorter crosscuts also extend to the south on good-looking spur veins or stringers, but in no case more than about 30 feet, which seems to indicate that the values were too low to pay.

The principal equipments are a good gasoline hoist and a small mill at Hardyville, near the mouth of Silver Creek, on Colorado River, 7 miles distant.

Geology. The country rock is a quartz syenite porphyry phase of the granite porphyry and micropegmatite described on page 30, butcontains more hornblende and biotite. It forms a considerable part of the Moss Hills and underlies the younger volcanic rocks in the vicinity. Northward it extends for a distance of half a mile or more to a point about one-fourth of a mile beyond the Moss mine saddle and southward nearly to Silver Creek and the Holmes camp, probably connecting locally with the same rock in the Hardy Mountains. It weathers reddish brown.

Veins and ore. The Moss vein as seen underground has a width of about 22 feet and a known extent of more than half a mile and a reported extent of about 4 miles, being held by some to connect with the Moss Back vein. It dips steeply to the south and is associated with considerable fault breccia on its foot-wall side. Both sides of the vein are frozen to the walls, and in consequence of this the walls are torn and ragged where the vein has been mined. The-croppings, which in large part are prominent and of the Gold Road type, consist principally of a surficially iron-stained mixture of quartz and crystalline calcite and probably adularia and silicified rock, which-in part is porous or honeycombed and is cut by a cross sheeting or slickensiding.

In the underground and less-oxidized vein the quartz and calcite are present in about equal amount and the quartz seems to have replaced calcite, both minerals being usually fine grained and very intimately intermixed or intergrown. The quartz is mainly of a greenish hue, like that of the Gold Road vein, but a considerable portion is also pale rose-red, from which the vein has commonly come to be known as the rose-quartz vein.

Under the microscope a section of the ore shows coarse granular quartz,with coarse calcite grains, also acicular calcite in triangular pattern and intervening finer-grained quartz; the quartz appears divided in sectors through the distribution of radial inclusions, probably mostly fluid. No adularia was seen in the section, but it is probably present in the ore.

East of the mine, at the wagon-road gap, where a good surface opening has lately been made, the vein has narrowed to a few feet in width, and in the most easterly crosscut on the level of the tunnel inthe mine, about 100 feet east of the shaft, it is split into several parts or stringers by horses and inclusions of the country rock.

Nearly the whole production seems to have been obtained from very rich pockets or concentrates in the croppings and highly oxidized ore near the surface, for deeper work shows the deposit to consist principally of a large body of low-grade ore, much of it averaging about $4 in gold to the ton. Several tons of the ore are reported to have averaged $6,800; two tons $42,500 each in San Francisco; and a lot of about 100 tons, which was treated at the small mill at Hardyville, about $42 a ton.

Lying near the Moss vein on either side are one or more small veins or ledges, on which assessment work is kept up. The principal one on the north is about parallel with and 500 feet distant from the Moss vein, and contains much fluorspar.



Mineralization is an immense gold ledge (Mineral occurrence model information: Model code: 150; USGS model code: 25c; Deposit model name: Epithermal vein, Comstock; Mark3 model number: 16), hosted in the Moss Quartz Monzonite-porphyry. nearly 40 feet wide. The ore body strikes N80W and dips 70S at a thickness of 67 meters, width of 30 meters and a length of 1,609 meters. Ore body No. 1 is a fissure vein. Ore body No. 2 is a shear zone. The primary mode of origin was hydrothermal activity. The vein strikes N78W and dips 70S. The lode is from 20 to more than 100 feet wide at the West end. It is traceable for more than 1 mile on the surface. The vein filling consists of fine-grained white quartz and calcite with stringers of colorless to pale-green fluorite, The largest ore shoot consisted of free gold in iron-stained quartz but only to 65 feet deep. Other, smaller ore bodies were founbd from near the surface to depths of 220 feet at various places along the vein. Local alteration includes oxidation. Associated rocks include Pliocene trachyte. Local rocks include Middle Miocene to Oligocene granitic rocks.

Regional geologic structures include a NNW- To WNW-trending vein and fault system in Tertiary volcanic rocks.

Workings include underground openings with a length of 502.92 meters and an overall depth of 70.1 meters, and comprised of shafts at 230 feet and 98 feet deep, respectively (1881), plus 1,700 feet of levels, drifts, etc.

Production statistics: $500,000 prior to 1909

Analytical data results: Vein at 220 foot level is 90 feet wide and carries 0.15 to 0.2 ounce Au/ton.

Reserves and resources data: In-situ (estimate year = 1986): Total resources 113,000 metric tons of ore with Au at 7.604 grams/metric ton.

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Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


11 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!


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Alphabetical ListTree Diagram


Entries shown in red are rocks recorded for this region.

Detailed Mineral List:

ⓘCalcite

Formula: CaCO3

Reference: Wilson, E.D., et al (1934), AZ Bur. of Mines Bull. 137: 94.

ⓘChalcocite

Formula: Cu2S

Reference: MRDS file #10027926.

ⓘChalcopyrite

Formula: CuFeS2

Reference: MRDS file #10027926.

ⓘChrysocolla

Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O

Reference: MRDS file #10027926.

trans.png
ⓘFluorite

Formula: CaF2

Colour: Colorless to pale green

Description: As stringers in quartz veins.

Reference: Wilson, E.D., et al (1934), AZ Bur. of Mines Bull. 137: 94; Ransome, F.L. (1923), Geology of the Oatman Gold District, Arizona, USGS Bull. 743: 33.

ⓘGold

Formula: Au

Description: As free lode gold in iron-stained quartz; included in fluorite.

Reference: The Resources of Arizona - A Manual of Reliable Information Concerning the Territory, compiled by Patrick Hamilton (1881), Scottsdale, AZ: 70; The History of Arizona, Chap. X: 74; Wilson, E.D., et al (1934), AZ Bur. of Mines Bull. 137: 94; Ransome, F.L. (1923), Geology of the Oatman Gold District, Arizona, USGS Bull. 743: 33.

ⓘHematite

Formula: Fe2O3

Reference: MRDS file #10027926.

ⓘMarcasite

Formula: FeS2

Description: As thin plates in quartz.

Reference: Galbraith, F.W. (1947), AZ Bur. of Mines Bull. 153, Minerals of AZ: 24.

ⓘPyrite

Formula: FeS2

Reference: MRDS file #10027926.

ⓘQuartz

Formula: SiO2

Description: Locally abundant in gangue.

Reference: Galbraith, F.W. & Brennan (1959), Minerals of AZ: 84.

ⓘQuartz var. Rose Quartz

Formula: SiO2

Description: Locally abundant in gangue.

Reference: Galbraith, F.W. & Brennan (1959), Minerals of AZ: 84.

ⓘWulfenite

Formula: Pb(MoO4)

Reference: MRDS file #10027926.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Chalcocite2.4.7.1Cu2S
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Marcasite2.12.2.1FeS2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 48 - ANHYDROUS MOLYBDATES AND TUNGSTATES
AXO4
Wulfenite48.1.3.1Pb(MoO4)
Group 74 - PHYLLOSILICATES Modulated Layers
Modulated Layers with joined strips
Chrysocolla74.3.2.1Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
var. Rose Quartz-SiO2

List of minerals for each chemical element

References

Sort by

Year (asc)Year (desc)Author (A-Z)Author (Z-A)In-text Citation No.

The Resources of Arizona - A Manual of Reliable Information Concerning the Territory, compiled by Patrick Hamilton (1881), Scottsdale, AZ: 70.

Schrader, F.C. (1909), Mineral deposits of the Cerbat Range, Black Mountains, and the Grand Wash Cliffs, Mohave County, Arizona: USGS Bulletin 397: 170-172, 43.

Schrader, F.C. (1917), A.I.M.E. Transactions: 208, 226.

Ransome, F.L. (1923), Geology of the Oatman Gold District, Arizona, USGS Bulletin 743: Plate 1, 33, 46-48.

Lausen, Carl (1931), Geology and Ore Deposits of the Oatman and Katherine Districts, Arizona Bureau of Mines Bulletin 131: 113-115, 9, 12, 44-45, 52, 60, 74, 84-85.

Wilson, E.D., Cunningham, J.B., and Butler, G.M. (1934), Arizona Lode Gold Mines and Gold Mining (revised 1967), Arizona Bureau of Mines Bulletin 137: 94.

Gardner, E.D. (1936), Gold mining and milling in the Black Mountains, western Mohave County, Arizona, U.S. Bureau of Mines Information Circular IC 6901: 39.

Galbraith, F.W. (1947), Arizona Bureau of Mines Bulletin 153, Minerals of Arizona: 24.

Galbraith, F.W. & Brennan (1959), Minerals of Arizona: 84.

Arizona Department of Mineral Resources [ADMR] (1987), Report D-29(87), 46 pages.Mineral Resources Directory 29, 46 pp.

Niemuth, Nyal J. (1987), Arizona Mineral Development 1984-1986, Arizona Department of Mines &

Sawyer, M.B., Gurmendi, A.C., Daley, M.R., and Howell, S.B. (1992) Principal Deposits of Strategic and Critical Minerals in Arizona, U.S. Bureau of Mines Special Publication, 334 pages.

U.S. Bureau of Mines (1995), Minerals Availability System/Mineral Industry Location System (MAS/MILS), U.S. Bureau of Mines, file ID #0040150220.

Arizona Department of Mineral Resources (ADMR), Householder map.

Arizona Department of Mineral Resources (ADMR), Householder map.

Arizona Department of Mineral Resources (ADMR), Mohave card file.

Arizona Department of Mineral Resources (ADMR), Mohave card file.

Arizona Department of Mineral Resources (ADMR), Moss Mine file.

The History of Arizona, Chapter X: 74.

USGS MRDS ID #M004525.


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Moss Mine

The Moss Mine is a gold mine located in Mohave county, Arizona at an elevation of 2,159 feet.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

Name: Moss Mine  

State:  Arizona

County:  Mohave

Elevation: 2,159 Feet (658 Meters)

Primary Mineral: Gold

Lat, Long: 35.09972, -114.44667

Map:View on Google Maps

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Mine Description

The Moss mine is about 7 miles northwest of Oatman and 2 miles north of Silver Creek.

This deposit was probably the first to be worked in the district. During the early days, it made a reported production of $240,000 from near the surface. Since that time, considerable intermittent development has been carried on, but little ore has been mined.

The vein strikes N. 78° W., dips 70° S., and occurs in the Moss quartz monzonite-porphyry. It forms a lode from 20 to more than 100 feet wide, with the widest portion at the western end, and is traceable on the surface for more than a mile east of the mine.

The vein filling consists of fine-grained white quartz and calcite, with stringers of colorless to pale-green fluorite. The largest ore shoot consisted of free gold in iron-stained quartz but extended to a depth of only 65 feet. Several smaller ore bodies were mined from near the surface at various places along the vein.

Workings on the Moss vein include a 230-foot shaft with about 750 feet of workings, about 900 feet of tunnel, and some irregular surface openings. Ransome states that the vein on the 220 level appears to be 90 feet wide and as a whole probably carries from 0.15 to 0.20 ounces of gold per ton.

Source: Arizona Lode Gold Mines and Gold Mining, Bulletin137, Arizona Bureau of Mines. Revised 1967

Moss Mine MRDS details

Site Name

Primary: Moss Mine


Commodity

Primary: Gold
Secondary: Silver
Tertiary: Fluorine-Fluorite
Tertiary: Copper


Location

State: Arizona
County: Mohave
District: San Francisco District


Land Status

Land ownership: BLM Administrative Area
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land or if it is in an area that is generally private property. It does not indicate a claim status and does not necessarily indicate an area is open to prospecting.


Holdings

Not available


Workings

Type: Underground


Ownership

Not available


Production

Not available


Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1864
Year Last Production: 1909
Discovery Year: 1864
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: Y
Deposit Size: S


Physiography

General Physiographic Area: Intermontane Plateaus
Physiographic Province: Basin And Range Province
Physiographic Section: Mexican Highland


Mineral Deposit Model

Model Name: Epithermal vein, Comstock


Orebody

Form: LODE


Structure

Type: R
Description: Nnw To Wnw Trending Vein And Fault System In Tert Volcanic Rocks


Alterations

Alteration Type: L
Alteration Text: Oxidation


Rocks

Name: Trachyte
Role: Associated
Age Type: Associated Rock
Age Young: Pliocene

Name: Trachyte
Role: Associated
Age Type: Host Rock
Age Young: Pliocene


Analytical Data

Analytical Data: VEIN AT 220-FOOT LEVEL, 90 FEET WIDE, CARRIES 0.15 TO 0.2 OZ. AU/TON.


Materials

Ore: Chrysocolla
Ore: Chalcocite
Ore: Gold
Ore: Marcasite
Ore: Chalcopyrite
Ore: Wulfenite
Ore: Pyrite
Gangue: Hematite
Gangue: Calcite


Comments

Comment (Deposit): ONE ORE SHOOT CONTAINED FREE GOLD AND WAS EXCEPTIONALLY RICH ORE. THIS SHOOT EXTENDED DOWN FROM THE SURFACE TO A DEPTH OF 65 FEET. OTHER SMALLER ORE BODIES WERE FOUND FROM NEAR THE SURFACE TO DEPTHS OF 220 FEET AT VARIOUS PLACES ALONG THE VEIN.

Comment (Commodity): DISTRICT ALSO HAS SMALL AMOUNT OF CHALCOPYRITE, CHALCOCITE, PYRITE, CHRYSOCOLLA, RED PB OXIDES, AND WULFENITE.


References

Reference (Deposit): SCHRADER, F.C., 1909, MINERAL DEPOSITS OF THE CERBAT RANGE, BLACK MOUNTAINS, AND THE GRAND WASH CLIFFS, MOHAVE COUNTY, ARIZONA: U.S.G.S. BULL. 397, P. 170.

Reference (Deposit): WILSON, E.D., 1934, ARIZONA LODE GOLD MINES AND GOLD MINING: ARIZONA BUREAU OF MINES BULLETIN 137, P. 94.

Reference (Deposit): LAUSEN, C., 1931, GEOLOGY AND ORE DEPOSITS OF THE OATMAN AND KATHERINE DISTRICTS, ARIZONA: ARIZONA BUREAU OF MINES BULLETIN 131, P. 113.

Reference (Deposit): NIEMUTH, N.J., 1987, ARIZONA MINERAL DEVELOPMENT 1984-1986: ARIZONA DEPARTMENT OF MINES AND MINERAL RESOURCES DIRECTORY 29, 46 P.

Reference (Deposit): PHILLIPS, K.A., 1987, ARIZONA INDUSTRIAL MINERALS: ARIZONA DEPARTMENT OF MINES AND MINERAL RESOURCES MINERAL REPORT 4, 185 P.

Reference (Deposit): SAWYER, M.B., GURMENDI, A.C., DALEY, M.R., AND HOWELL, S.B., 1992, PRINCIPAL DEPOSITS OF STRATEGIC AND CRITICAL MINERALS IN ARIZONA: U.S. BUREAU OF MINES SPECIAL PUBLICATION, 334 P.

Reference (Other Database): CIMRI

Reference (Production): U.S.G.S. BULL. 397, P. 170.

Reference (Reserve-Resource): NIEMUTH, 1987.


Sours: https://westernmininghistory.com/mine_detail/10027926/
An aerial view of the open pit taking shape at the Moss Mine in N.W. Arizona, USA.

HIGHLIGHTS:

  • 100% owned Moss Gold Mine in northwest Arizona, USA
  • Low cost, open pit mine with heap leach processing
  • Gold recoveries of 82% with silver recoveries of 65% (2015 Feasibility Study)
  • 2017 PEA outlined a 10-year mine life, $133 NPV and a 63% IRR (before taxes)
  • Crushing throughput consistently exceeding 2015 Feasibility Study of 5,000 tonnes per day (tpd)  
  • Excellent exploration upside adjacent to open pit and within the Oatman mining district 

 

OVERVIEW

Elevation Gold's 100% owned Moss Gold Mine is located in Arizona, approximately one hour and a half drive south of Las Vegas, Nevada. The Company optioned the Moss Property in 2011 and advanced the project by completing a pilot plant test facility in 2014.  In 2015, the Company completed a Feasibility Study and subsequently a Preliminary Economic Assessement in 2017, which featured an extension to the mine life from 5 to 10 years.  Shortly after a successful construction and the commissioning process in 2018, Elevation Gold declared commercial production at the Moss Mine, effective September 2018.

 

MINING & PROCESSING

The Moss Mine is an open pit gold-silver operation, with a favorable strip ratio of approximately 1.85:1 (waste to ore) and minimal haul distances to the crushing plant.  The most economic and effective way to process the ore is through crushing, agglomeration and heap leaching followed by processing at the on-site Merrill Crowe metal recovery plant and refinery to produce gold and silver doré bars.  According to the Company's Feasibility Study (2015), throughput at the Moss Mine was expected to be 5,000 tonnes per day (tpd), however since commissioning was announced in 2018, throughput has been significantly higher due to exceptional performance of the crushing plant and operational team, which set a one-day throughput record of 13,000 tonnes.  

 

RESOURCE ESTIMATE 

Moss Mine Mineral Resource Estimate as at December 31, 2019:

Category TonsAu
(oz/st)
Ag
(oz/st)
Au
(ozs)
Ag
(ozs)
Measured2,270,0000.02320.253353,000575,000
Indicated18,290,0000.01680.2126307,0003,888,000
Measured and Indicated20,560,0000.01750.2171360,0004,463,000
Inferred11,960,0000.01080.1149129,0001,375,000

NOTES: Mineral Resources are reported inclusive of Mineral Reserves. Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability. Mineral Resources for the project were classified under the 2014 CIM Definition Standards for Mineral Resources and Mineral Reserves by applying a cut-off grade that incorporated mining and metallurgical recovery parameters. Pit constrained Mineral Resources are based on commodity prices, metallurgical recoveries and operating costs. The mineral resource includes depletion from mining activities up to December 31, 2019. Long-term metal prices of $1,400/oz and $18/oz for gold and silver respectively were used. The updated Mineral Resource estimate for the Property was prepared by David G. Thomas, P.Geo. (the “QP”) of Mine Technical Services Ltd. (“MTS”). Resources have an effective date of December 31, 2019 and are reported at a 0.006 oz/st gold cut-off grade.

The updated mineral resource estimate incorporates the results of the 2019 reverse circulation infill drill program (the “Program”) carried out at the Property, totaling 14,140 feet over 29 holes, disclosed in the Company’s press release dated December 18, 2019. Drilling within the western area of the Moss Gold Mine and west of the current mining operation successfully demonstrated that there are significantly more resources hosted within and nearby the current pit. Compared to the previously disclosed mineral resource estimate contained in the Company’s most recent technical report for the Property dated November 22, 2017 (the “Technical Report”), the updated mineral resource estimate of the Property constitutes a non-material increase in total tonnage and contained gold metal, with additional new resources identified from infill drilling more than offsetting depletion from mining activities.

The resource estimate update found that from the start of operations to December 31, 2019, mining operations depleted approximately 71,000 ounces of gold, however with drilling success, these mined ounces have been more than offset by an addition of 86,000 ounces of gold in the inferred category. In comparing the updated December 31, 2019 resource estimate to the resource estimate in the Technical Report, aggregate measured and indicated gold ounces fell by approximately 8% primarily due to depletion from mining activities, while inferred gold ounces grew by almost 300% due to the identification of new resources from infill drilling. 

Exploration upside potential at Moss is excellent as the deposit continues to remain open for resource expansion along strike (at both ends) and at depth.

 

TECHNICAL REPORTS

Technical Report, 2017 PEA Phase III, Mine Life Extension
Technical Report, 2015 Feasibility Study, Mohave County
Technical Report, 2014 Mineral Resource Update

Sours: https://www.northernvertex.com/projects/moss-gold-silver-project/

Arizona moss mine

Moss Mine

  • Deposit

    SCHRADER, F.C., 1909, MINERAL DEPOSITS OF THE CERBAT RANGE, BLACK MOUNTAINS, AND THE GRAND WASH CLIFFS, MOHAVE COUNTY, ARIZONA: U.S.G.S. BULL. 397, P. 170.

  • Deposit

    WILSON, E.D., 1934, ARIZONA LODE GOLD MINES AND GOLD MINING: ARIZONA BUREAU OF MINES BULLETIN 137, P. 94.

  • Deposit

    LAUSEN, C., 1931, GEOLOGY AND ORE DEPOSITS OF THE OATMAN AND KATHERINE DISTRICTS, ARIZONA: ARIZONA BUREAU OF MINES BULLETIN 131, P. 113.

  • Deposit

    NIEMUTH, N.J., 1987, ARIZONA MINERAL DEVELOPMENT 1984-1986: ARIZONA DEPARTMENT OF MINES AND MINERAL RESOURCES DIRECTORY 29, 46 P.

  • Deposit

    PHILLIPS, K.A., 1987, ARIZONA INDUSTRIAL MINERALS: ARIZONA DEPARTMENT OF MINES AND MINERAL RESOURCES MINERAL REPORT 4, 185 P.

  • Deposit

    SAWYER, M.B., GURMENDI, A.C., DALEY, M.R., AND HOWELL, S.B., 1992, PRINCIPAL DEPOSITS OF STRATEGIC AND CRITICAL MINERALS IN ARIZONA: U.S. BUREAU OF MINES SPECIAL PUBLICATION, 334 P.

  • Other Database

    CIMRI

  • Production

    U.S.G.S. BULL. 397, P. 170.

  • Reserve-Resource

    NIEMUTH, 1987.

  • Sours: https://mrdata.usgs.gov/mrds/show-mrds.php?dep_id=10027926
    Moss Mine

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