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Mexico
Penasquito Mine

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 Location:
14 km W from Mazapil, Zacatecas, Mexico

  Regional Office:
Paseo de las palmas 425-15 Lomas de Chapultepec
Mexico, D. F.
Mexico, Mexico
11000
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
  • Silver
  • Lead
  • Zinc
Mining Method
  • Truck & Shovel / Loader
Processing
  • Flotation
  • ROM/dump leach
  • Counter current decantation (CCD)
  • Agitated tank (VAT) leaching
  • Leaching plant / circuit
  • Merrill–Crowe
  • Cyanide (reagent)
Mine Life12 years (as of Jan 1, 2020)
Latest NewsNewmont Goldcorp Safely Starting Up Production at Peñasquito Mine in Mexico     October 22, 2019


Owners

Source: p. 37
CompanyInterestOwnership
Newmont Corp. 100 % Indirect
Minera Peñasquito S.A. de C.V. is 100% owned by Goldcorp Inc.

On April 18, 2019, Newmont Mining Corp. and Goldcorp Inc. completed their merger to form Newmont Goldcorp Corp.

Deposit Type

  • Skarn
  • Breccia pipe / Stockwork


Summary:

Deposits within the Peñasquito Operations are considered to be examples of breccia pipe deposits developed as a result of intrusion-related hydrothermal activity.

In addition to the deposit types already identified and exploited, there is potential for additional deposit styles within the extensive Peñasquito Operations area, including base metal skarns and porphyry-related disseminated deposits. Exploration for these mineralization styles is ongoing.

Peñasco and Brecha Azul are funnel-shaped breccia pipes, which flare upward, and are filled with brecciated sedimentary and intrusive rocks, cut by intrusive dikes.

The larger diatreme, Peñasco, has a diameter of 900 m by 800 m immediately beneath surface alluvial cover, and diatreme breccias extend to at least 1,000 m below surface. The Brecha Azul diatreme, which lies to the southeast of Peñasco, is about 500 m in diameter immediately below alluvium, and diatreme breccias also extend to at least 1,000 m below surface. Porphyritic intrusive rocks intersected in drilling beneath the breccias may connect the pipes at depth.

The Peñasco and Brecha Azul diatremes are considered to represent breccia-pipe deposits developed as a result of Tertiary intrusion-related hydrothermal activity. Alteration, mineral zoning, porphyry intrusion breccia clasts, and dikes all suggest the diatreme-hosted deposits represent distal mineralization some distance above an underlying quartz-feldspar porphyry system.

Manto-style sulphide replacements of carbonate strata have been discovered beneath the clastic-hosted disseminated sulphide zones, and adjacent to the diatreme pipes. The mantos consist of semi-massive to massive sulphide replacements of subhorizontal limestone beds, as well as cross-cutting chimney-style, steeply-dipping, fracture and breccia zones filled with high concentrations of sulphides.

Garnet skarn-hosted polymetallic mineralization has been identified at depth between the Peñasco and Brecha Azul diatremes. The skarn has horizontal dimensions of approximately 1,000 m by 1,200 m and is open at depth.

Both deposits are centered on diatreme breccia pipes, the Peñasco diatreme at Peñasco, and the Brecha Azul diatreme at Chile Colorado. The diatremes contain and are surrounded by disseminated, veinlet and vein-hosted sulphides and sulphosalts containing silver and gold.

Mineralization consists of disseminations, veinlets and veins of various combinations of medium to coarse-grained pyrite, sphalerite, galena, and argentite (Ag2S). Sulphosalts of various compositions are also abundant in places, including bournonite (PbCuSbS3), jamesonite (PbSb2S4), tetrahedrite, polybasite ((Ag,Cu)16(Sb,As)2S11), and pyrargyrite (Ag3SbS3). Stibnite (Sb2S3), rare hessite (AgTe), chalcopyrite, and molybdenite have also been identified. Telluride minerals are the main gold-bearing phase, with electrum and native gold also being identified.

Gangue mineralogy includes calcite, sericite, and quartz, with rhodochrosite, fluorite, magnetite, hematite, garnets (grossularite-andradite) and chlorite–epidote. Carbonate is more abundant than quartz as a gangue mineral in veins and veinlets, particularly in the “crackle breccia” that occurs commonly at the diatreme margins.

Breccia-hosted mineralization is dominated by sulphide disseminations within the matrix with lesser disseminated and veinlet-controlled mineralization in clasts. All breccia types host mineralization, but the favoured host is the intrusion-clast breccia. Much of the mineralization within the Peñasco and Brecha Azul pipes lies within the intrusion-clast breccia.

All of the dike varieties may also be mineralized, and they are almost always strongly altered. Mineralization of dikes occurs as breccia matrix fillings, disseminations and minor veinlet stockworks at intrusion margins, and veinlets or veins cutting the more massive dikes. Mineralized dikes form an important ore host in the Peñasco diatreme but are not as abundant in Brecha Azul.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Penasquito operations consist of two open pits – Peñasco and Chile Colorado.

Overall pit slope angles vary by sector within both Peñasco and Chile Colorado open pits. The overall designs are based around double benching of 15 m mining bench intervals and take into account haulage ramp positioning, safety berms and other geotechnical features required to maintain safe inter-ramp slope angles.

Mining is conducted using conventional open pit truck and shovel techniques.

Open pit mining is undertaken using a conventional truck-and-shovel fleet, currently consisting of seventy-eight haul trucks, five rope shovels, two hydraulic shovels and four loaders. The fleet is supported by twelve blast hole productions drills, track dozers, rubber tire dozers, excavators, and graders; the mining fleet is owner-operated. Maintenance of mine equipment is covered by MARC contracts with current strategy to move towards owner-based maintenance. The current loading capacity of the mining fleet is sufficient for the current 12-year LOM; however, additional haul trucks will need to be added to the fleet over the next several years as the haulage profiles continue to increase with greater pit depths and distance to the waste dumps.

Drilling for all materials is on 15 m benches drilled with 1.0 to 1.5 m of sub-drilling. Drill patterns range from 9.00 m x 9.00 m in overburden to 4.30 m x 5.00 m in sulphide ore.

Blasting is carried out primarily with conventional ANFO explosives, sup explosives contractor. Appropriate powder factors are used to match ore, waste, and overburden types.


Crushing and Grinding
Flow Sheet: Source
Crusher / Mill TypeModelSizePowerQuantity
Gyratory crusher ....................... Subscription required 60" x 113" 1
Cone crusher ....................... Subscription required 820 kW 1
Cone crusher ....................... Subscription required 600 kW 3
High Pressure Grinding Rolls (HPGR) ....................... Subscription required 1
SAG mill ....................... Subscription required 11.6m x 6.1m 19400 kW 2
Ball mill ....................... Subscription required 7.3m x 11.3m 6000 kW 4
Regrind ....................... Subscription required 1

Summary:

Oxide Ore
Run-of-mine (ROM) ore is delivered to the heap leach pile from the mine by haul trucks.

Sulphide Ore
Run-of-mine sulphide ore is delivered to the crusher dump pocket from the mine by 290 tonne rear-dump-haul trucks. Sulphide ROM ore is delivered to the crusher dump pocket from the mine. The crushing circuit is designed to process up to 148,000 t/d of ROM ore to a crush size of 80% passing (P80 value) of 159 mm size. The crushing facility consists of a gyratory crusher capable of supporting the 92% utilization on a 24-hour-per-day, 365-days-per-year basis of the processing plant. A near-pit sizing conveyor (NPSC) has since been included to support higher throughput by facilitating waste removal.

Product from the gyratory crusher discharges into a 500 t surge pocket directly below the crusher. The crusher feeds, via an apron feeder, a coarse ore stockpile that has a 91,800 t live capacity. A total of ten apron feeders arranged in two lines, of five feeders each, reclaim ore from the coarse ore stockpile. Nine feeders report the coarse ore to two semi-autogenous grind (SAG) mills operating in closed circuit with pebble crushers and one unit the high pressure grind rolls (HGPR). Each SAG mill operates with two ball mills.

The pebble crushing circuit includes three cone crushers working in parallel and one HPGR unit working in tandem with the cone crushers. An augmented crusher is fed directly with coarse ore stockpile material by a single apron feeder and the product is dry screened. The oversize from the augmented crusher screen together with the oversize from the SAG trommel screens constitutes the feed to the pebble cone crushers. The pebble crusher product together with the fines produced by the augmented crusher screen are discharged to a bin that feeds the HPGR or, when necessary, feeds directly to the SAG mills.

Each grinding circuit reduces the crushed ore from a passing P80 of 159 mm size to a passing P80 of 125 pm. The SAG trommel screen undersize (minus 19 mm material) discharges to a common sump. Secondary grinding is performed in four ball mills, operating in closed circuit with cyclones. Ball mill discharge is combined with SAG mill trommel screen undersize and the combined slurry is pumped to the primary cyclone clusters. Cyclone underflow reports back to the ball mills. Cyclone overflow flows by gravity to the flotation area as final grinding product. The flotation area is comprised of carbon, lead and zinc flotation circuits.


Processing

  • Flotation
  • ROM/dump leach
  • Counter current decantation (CCD)
  • Agitated tank (VAT) leaching
  • Leaching plant / circuit
  • Merrill–Crowe
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The Peñasquito Operations consist of a heap leach gold and silver recovery facility that can process a nominal 25,000 t/d of oxide ore and a sulphide plant that processes a nominal 124,000 t/d of sulphide ore.

Oxide Ore
Run-of-mine (ROM) ore is delivered to the heap leach pile from the mine by haul trucks. Lime is added to the ore, prior to addition of the ore to the pad. Ore is placed in 10 m lifts, and leached with cyanide solution. Pregnant leach solution is clarified, filtered, and de-aerated, then treated with zinc dust to precipitate the precious metals. The precipitated metals are subsequently pressure filtered, and the filter cake smelted to produce doré.

Sulphide Ore
Run-of-mine sulphide ore is delivered to the crusher dump pocket from the mine by 290 tonne rear-dump-haul trucks. Sulphide ROM ore is delivered to the crusher dump pocket from the mine. The crushing circuit is designed to process up to 148,000 t/d of ROM ore to a crush size of 8 ........

Recoveries & Grades:

CommodityParameter2020201920182017201620152014
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required5966637270
Gold Head Grade, oz/ton  ......  Subscription required  ......  Subscription required0.420.660.710.65
Silver Recovery Rate, %  ......  Subscription required  ......  Subscription required7982798079
Silver Head Grade, oz/ton  ......  Subscription required  ......  Subscription required23.123.52328.326.8
Lead Recovery Rate, %  ......  Subscription required  ......  Subscription required7174727174
Lead Head Grade, %  ......  Subscription required  ......  Subscription required0.230.230.220.30.25
Zinc Recovery Rate, %  ......  Subscription required  ......  Subscription required8081777980
Zinc Head Grade, %  ......  Subscription required  ......  Subscription required0.60.640.540.680.56

Production:
Peñasquito produced 129,000 ounces of gold and 443,000 gold equivalent ounces of other metals since the completion of the acquisition of the mine site as part of the Newmont Goldcorp transaction on April 18, 2019.

CommodityProductUnits2020201920182017201620152014
Gold Metal in conc./ doré koz  ......  Subscription required  ......  Subscription required
Silver Metal in conc./ doré koz  ......  Subscription required  ......  Subscription required
Lead Metal in concentrate M lbs  ......  Subscription required  ......  Subscription required
Zinc Metal in concentrate M lbs  ......  Subscription required  ......  Subscription required
Gold Equivalent koz  ......  Subscription required  ......  Subscription required
Gold Payable metal koz 272476465860568
Silver Payable metal koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead Payable metal M lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc Payable metal M lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Equivalent Payable metal koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018201720162015
Total tonnes mined  ......  Subscription required86,645 k tons181,612 kt194,041,300 t
Ore tonnes mined  ......  Subscription required21,483 k tons47,841 kt42,117,800 t
Waste  ......  Subscription required65,162 k tons133,771 kt151,923,500 t
Tonnes processed  ......  Subscription required15,038 k tons35,248 kt37,083 kt35,218 kt41,908 kt
Daily milling capacity  ......  Subscription required124,000 t130,000 t130,000 t130,000 t
Stripping / waste ratio  ......  Subscription required2.8 3.6
Daily milling rate  ......  Subscription required106,500 t
Subscription required - Subscription is required.

Reserves at December 31, 2020:

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven & Probable Stockpiles 39,600 kt Gold 0.33 g/t 420 koz
Proven & Probable In-Situ (OP) 348,200 kt Gold 0.6 g/t 6,680 koz
Proven & Probable Total 387,800 kt Gold 0.57 g/t 7,100 koz
Proven & Probable Stockpiles 39,600 kt Silver 25.81 g/t 32,860 koz
Proven & Probable In-Situ (OP) 348,200 kt Silver 35.1 g/t 392,890 koz
Proven & Probable Total 387,800 kt Silver 34.15 g/t 425,750 koz
Proven & Probable Stockpiles 39,600 kt Lead 0.33 % 130,000 t
Proven & Probable In-Situ (OP) 348,200 kt Lead 0.34 % 1,200,000 t
Proven & Probable Total 387,800 kt Lead 0.34 % 1,330,000 t
Proven & Probable Stockpiles 39,600 kt Zinc 0.49 % 190,000 t
Proven & Probable In-Situ (OP) 348,200 kt Zinc 0.83 % 2,890,000 t
Proven & Probable Total 387,800 kt Zinc 0.8 % 3,080,000 t
Measured & Indicated Total 276,800 kt Gold 0.27 g/t 2,420 koz
Measured & Indicated Total 276,800 kt Silver 26.75 g/t 238,070 koz
Measured & Indicated Total 276,800 kt Lead 0.28 % 760,000 t
Measured & Indicated Total 276,800 kt Zinc 0.6 % 1,670,000 t
Inferred Total 150,900 kt Gold 0.4 g/t 1,910 koz
Inferred Total 150,900 kt Silver 26.36 g/t 127,920 koz
Inferred Total 150,900 kt Lead 0.27 % 400,000 t
Inferred Total 150,900 kt Zinc 0.53 % 790,000 t

Commodity Production Costs:

CommodityUnits202020192018201720162015
Total cash costs (sold) Gold Equivalent USD  ......  Subscription required  ......  Subscription required
Total cash costs Gold USD 756 / oz 678 / oz 780 / oz 562 / oz
Total cash costs (sold) Gold USD  ......  Subscription required†  ......  Subscription required†
Total cash costs Gold USD -80 / oz† -106 / oz† 483 / oz† 320 / oz†
All-in sustaining costs (sold) Gold Equivalent USD  ......  Subscription required  ......  Subscription required
All-in sustaining costs (sold) Gold USD  ......  Subscription required†  ......  Subscription required†
All-in sustaining costs (AISC) Gold USD 648 / oz† 370 / oz† 937 / oz† 544 / oz†
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units201620152014
OP mining costs ($/t mined) USD 1.982.092.42
Processing costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Financials:

Units202020192018201720162015
Sustaining costs M USD  ......  Subscription required  ......  Subscription required189   213   195   186  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required525   537   235   202  
Revenue M USD  ......  Subscription required  ......  Subscription required1,050   1,400   1,044   1,646  
Operating Income M USD 55   370   99   -821  
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required


Heavy Mobile Equipment as of February 28, 2020:
HME TypeModelSizeQuantity
Dozer (crawler) ....................... Subscription required ....................... Subscription required
Dozer (crawler) ....................... Subscription required ....................... Subscription required
Dozer (crawler) ....................... Subscription required ....................... Subscription required
Dozer (rubber tire) ....................... Subscription required ....................... Subscription required
Drill ....................... Subscription required 10.625 inch ....................... Subscription required
Drill ....................... Subscription required 10.625 inch ....................... Subscription required
Drill ....................... Subscription required 4.5 inch ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Shovel (hydraulic) ....................... Subscription required ....................... Subscription required
Shovel (hydraulic) ....................... Subscription required ....................... Subscription required
Shovel (hydraulic) ....................... Subscription required ....................... Subscription required
Shovel (rope) ....................... Subscription required ....................... Subscription required
Truck (haul) ....................... Subscription required ....................... Subscription required
Truck (haul) ....................... Subscription required ....................... Subscription required
Truck (water) ....................... Subscription required ....................... Subscription required
Truck (water) ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Feb 24, 2021
....................... Subscription required ....................... Subscription required Subscription required Feb 24, 2021
....................... Subscription required ....................... Subscription required Subscription required Feb 24, 2021
....................... Subscription required ....................... Subscription required Subscription required Feb 24, 2021
....................... Subscription required ....................... Subscription required Subscription required Feb 24, 2021
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2019
Subscription required 2018
Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Corporate Presentation 2018
Management Discussion & Analysis 2018
Press Release 2018
Technical Report 2018
Year-end Mineral Reserves 2018
Annual Information Form 2017
Annual Report 2017
Press Release 2017
Year-end Mineral Reserves 2017
Annual Report 2016
Year-end Mineral Reserves 2016
Annual Information Form 2015
Annual Report 2015
Technical Report 2015
Annual Report 2014
Subscription required - Subscription is required.

News:

NewsDate
Newmont Goldcorp Safely Starting Up Production at Peñasquito Mine in Mexico October 22, 2019
Newmont Goldcorp Confirms Illegal Blockade Lifted at Peñasquito Mine in Mexico: Operations remain temporarily suspended ... October 9, 2019
Newmont Goldcorp Provides Update on Peñasquito Mine in Mexico September 15, 2019
Newmont Goldcorp Provides Update on Operations at Peñasquito Mine in Mexico April 29, 2019
Goldcorp Announces First Gold at the Pyrite Leach Project November 29, 2018

Aerial view:

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