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United States
Robinson Mine

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 Location:
7 km W from Ely, Nevada, United States

  Address:
4232 West White Pine County Road 44
Ruth
Nevada, United States
89319
Phone  ...  Subscription required
Fax775-289-7349
WebsiteWeb
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  • Overview
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  • Geology
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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Copper
  • Gold
Mining Method
  • Truck & Shovel / Loader
Processing
  • Flotation
Mine Life9 years (as of Jan 1, 2019)


Owners & OPERATOR

Source: p. 124, 126
CompanyInterestOwnership
KGHM Polska Miedz S.A. 100 % Indirect
Robinson Nevada Mining Co. (operator) 100 % Direct

Deposit Type

  • Porphyry
  • Skarn


Summary:

Copper mineralization at Robinson occurs in monzonite porphyry intrusive rocks and associated marginal garnet skarns with varying quantities of pyroxene, magnetite and sulfide which formed in the surrounding upper Paleozoic wall rocks. Early stage potassium silicate alteration in porphyry and skarn mineralization in the wall rocks are typically overprinted by a widespread and commonly intensive high acid alteration event which altered porphyry and some host units to quartz-sericite-pyrite or even advanced argillic assemblages locally. Carbonate host rocks were altered to pyritic marbles or silica pyrite rock containing up to 20 volume percent pyrite locally during this late stage alteration event. Early stage potassium silicate mineralization and skarn was dominated by pyrite and chalcopyrite and is generally low in sulfide with average values ranging from trace to 3%. The high acid alteration event is dominated by up to 10% or 20% pyrite with pyrite:chalcopyrite ratios typically ranging from 10:1 to more than 1,000:1. Where present in the late stage alteration zones, the chalcopyrite may be relict from earlier stage alteration events. Chalcopyrite appears to be the sole hypogene copper mineral, with a few possible exceptions.

Skarn and porphyry ores form much of the current resource and reserve with grades ranging from cutoff (and below) to greater than 1.0%. Metallurgical recoveries in this material are generally good, but are complicated where weathering has partially altered the sulfides or silicate gangue.

Mid-Tertiary extension and normal faulting dissected and rotated the hypogene copper deposits to their current configuration and they have been extensively oxidized, leached and enriched. The oxidation and enrichment is extensive, generally pervasive and intense. Faults and fracture zones locally modify the morphology of the leached and enriched zones, but in many places the upper surface of the original enrichment blankets parallel the surface. In light of this, it seems likely that much of the weathering and enrichment took place after the mid-Tertiary faulting.

Geology and Mineralization of the Tripp-Veteran Pit.
Monzonite porphyry, historically known as the “ore porphyry” intrudes Chainman formation shales, Ely formation cherty limestones, Reipe Springs limestone and Rib Hill sandstone in the Tripp-Veteran open pit.

Carbonate and fine grained clastic wall rocks on the distal margins of the ore deposit are recrystallized to marble and hornfels respectively. Shallower and proximal portions are characterized by strong hydrolytic overprinting of the prograde and potassium ilicate assemblages, yielding retrograde skarn assemblages and intensive and extensive quartzsericite-pyrite alteration in the intrusions. The nearer surface pyrite-rich retrograde and quartz- sericite-pyrite zones subsequently were oxidized and leached, and extensive chalcocite enrichment was superimposed on the system.

A moderately dipping, east-southeast striking, intact sequence of upper Ely formation cherty limestones, Reipe Springs limestone and Rib Hill sandstone are exposed on the western and southern benches of the open pit, generally above the 6700 elevation, on average. The northeastern wall of the pit is formed by the Footwall West fault, which separates the pit from the Weary Flat structural block - characterized by a north striking, westward facing, steeply dipping equence of lowermost Ely formation, Chainman shale, Joana limestone, Pilot shale and Guilmette formation. Monzonite porphyry is present within both of these stratigraphic domains.

The northwest trending Tripp-Veteran pit is separated from the Weary Flat structural block on the northeast by the steeply southwest dipping Footwall West fault, an ore boundary. Drill substantiated mineralization is present to the north of the Footwall West fault but lies outside the current pit design.

Geology and Mineralization of the Liberty Pit.
Supergene and hypogene sulfide ore bodies in the Liberty pit were hosted in altered porphyry and skarns in the Ely formation and upper parts of the Chainman formation. Rocks on the south side of the existing pit are now intensely weathered leached cap, probably after silica-pyrite altered limestones and calcareous sandstones of the Ely and Rib Hill formations, the few in-situ exposures of Chainman formation on the north are also intensely weathered leached cap.

Geology and Mineralization of the Ruth Pit.
Chainman, Ely, Reipe Springs and Rib Hill formations were intruded by monzonite porphyry within the Ruth open pit, and historically mined mineralization was hosted in porphyry and surrounding skarns of the Ely and Chainman formations. The Chainman and lower part of the Ely formation are separated from strongly altered limestone and sandstones of the upper Ely and the overlying Permian units along the west dipping High Grade fault. Rocks above and below this fault are strongly altered, but the best hypogene mineralization lies in porphyry and, to a lesser extent skarn, below the fault. Grades above the fault are generally lower and considerably more erratic. Geologically, the Ruth ore body is separated from the Liberty on the west by the Eureka fault, a 35º east dipping fault with more than 3,000 feet of down to the east movement, and bounded on the east by the Queen fault, a 40º to 50º east dipping fault with 500 feet or more of normal movement. All of these faults offset intrusive rocks and hypogene alteration and mineralization and are mid-Tertiary in age.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The mine is comprised of 3 large pits: Liberty, TrippVeteran and Ruth. Currently, Ruth is in operation.

Mining is conducted by conventional open-pit methods. It comprises extraction using blasting materials and dump trucks, loading and ore transport to a processing plant.


Crushing and Grinding


Processing

  • Flotation

Source: Subscription required

Summary:

The ore is extracted by conventional methods, and is then processed into a copper and gold concentrate, and separately into molybdenum concentrate in a concentrating plant.

The Robinson mill consists of a crushing circuit with one 60' x 89' gyratory crusher with a nominal capacity of 2,500 TPH, crushing to minus 6” material. The grinding circuit consists of one 32' x 14.75' (9.75 m x 4.50 m), 10,000 horsepower (HP) variable speed semi autogenous grinding (SAG) mill followed by two 20' x 30.5' (6.1 m x 9.3 m) 8750 horsepower closed circuit ball mills. The rougher flotation circuit consists of two parallel rows of ten 3,000 cubic feet flotation cells followed by cleaning in six 10' x 38' (3.05 m x 11.58 m) column flotation cells in a parallel configuration. No regrinding is currently being performed. The concentrates are thickened and filtered prior to shipment. The tailings are thickened and are transported by gravity flow to the tailings impoundment.

Recoveries & Grades:

CommodityParameter2014
Copper Head Grade, % 0.41
Gold Head Grade, g/t 0.15

Production:

CommodityUnits201920182017201620152014
Copper kt  ......  Subscription required  ......  Subscription required49545739
Gold koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as payable metal.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20142013
Ore tonnes mined 12.7 Mt16.2 Mt
Tonnes milled 13.7 Mt14.8 Mt

Reserves at December 31, 2014:

CategoryTonnage CommodityGradeContained Metal
Proven 110,513 kt Copper 0.42 % 464,831 t
Proven 110,513 kt Gold 0.15 g/t 16,949 kg
Probable 8,860 kt Copper 0.28 % 24,458 t
Probable 8,860 kt Gold 0.12 g/t 1,066 kg
Proven & Probable 119,374 kt Copper 0.41 % 489,289 t
Proven & Probable 119,374 kt Gold 0.15 g/t 18,016 kg
Measured 317,942 kt Copper 0.47 % 1,479,157 t
Measured 317,942 kt Gold 0.18 g/t 57,890 kg
Indicated 40,173 kt Copper 0.34 % 138,345 t
Indicated 40,173 kt Gold 0.15 g/t 5,873 kg
Measured & Indicated 358,115 kt Copper 0.45 % 1,617,502 t
Measured & Indicated 358,115 kt Gold 0.18 g/t 63,763 kg
Inferred 11,942 kt Copper 0.38 % 45,371 t
Inferred 11,942 kt Gold 0.18 g/t 2,101 kg

Commodity Production Costs:

CommodityUnits20142013
Cash costs (sold) Copper USD 2.52 / lb† 1.83 / lb†
† Net of By-Product.

Financials:

Units20142013
Capital expenditures M USD 121.5   113  
Revenue M USD 230.9   407.1  
Operating Income M USD -46.3   101.4  


Heavy Mobile Equipment as of December 31, 2009:
HME TypeModelSizeQuantity
Drill ....................... Subscription required 1
Drill ....................... Subscription required 2
Drill ....................... Subscription required 1
Loader (FEL) ....................... Subscription required 1
Loader (FEL) ....................... Subscription required 1
Shovel ....................... Subscription required 1
Shovel ....................... Subscription required 1
Shovel ....................... Subscription required 1
Shovel ....................... Subscription required 1
Truck (haul) ....................... Subscription required 240 tons 16
Truck (haul) ....................... Subscription required 150 tons 6
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 29, 2020
....................... Subscription required ....................... Subscription required Subscription required Sep 29, 2020
....................... Subscription required ....................... Subscription required Subscription required Sep 29, 2020
....................... Subscription required ....................... Subscription required Subscription required Sep 29, 2020
....................... Subscription required ....................... Subscription required Subscription required Sep 29, 2020
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2016
Subscription required 2015

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
Annual Report 2017
Annual Report 2016
Annual Report 2016
Annual Report 2015
Annual Report 2015
Year-end Mineral Reserves 2014
Technical Report 2009
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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