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Philippines
Co-O Mine

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 Location:
29 km S from San Francisco, Philippines

  Regional Office:
Bayugan 3,
Rosario,Agusan del Sur,
Philippines
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Shrinkage stoping
  • Room-and-pillar
Processing
  • Gravity separation
  • Concentrate leach
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life5 years (as of Jan 1, 2019)


Owners & OPERATOR

Source: p. 17, 108
CompanyInterestOwnership
Medusa Mining Ltd. 40 % Indirect
Philsaga Mining Corp. (operator) 100 % Direct
The Co-O Gold Mine is operated by Philsaga Mining Corporation.

Deposit Type

  • Porphyry
  • Skarn
  • Epithermal
  • Vein / narrow vein


Summary:

Mineralisation associated with the Philippine Rift Fault and Subduction System occurs as copper-gold porphyries, epithermal gold and skarn deposits associated with calcareous sediments. In Mindanao, the Diwata Ranges straddle the Philippine Rift Fault from north to south of the island.

Locally, gold mineralisation is controlled by strike-slip faults parallel to the Philippine Rift Fault or splay structures off the fault and dilationary structures which develop orthogonally to the main structures as a result of strike slip movements on structures parallel to the Philippine Rift Fault.

The PMC tenements are centrally located along an arc defining the known gold localities in Eastern Mindanao extending from Masara to Surigao with mineralisation partly controlled by intrusive bodies.

The mineralisation occurs as auriferous vein sets trending easterly in andesitic volcanics. Within the current workings to the east and west of the Oriental Fault, there are numerous steeply dipping quartz vein structures which are being mined to various depths down to 200 m below Level 1 over a maximum length of approximately 1000 m. The main vein structures, known as the Central Vein, Great Hamish Vein, Jeremy Vein and a number of others, are cut by north northwesterly trending reverse faults of limited displacement. Most of the veins have been defined by development over a strike length of approximately 1000 m in the immediate vicinity of the mine and are believed to possibly extend up to about 2000 m in strike length. The Co-O Mine works on a 3 shift, 24 hour, 26 day per month basis. The mine has its own team of airleg miners operating approximately 60 airleg machines, timbermen, bogger drivers, locomotive drivers, hoist drivers, surveyors, samplers, mappers, mine geologists, mining engineers, shift bosses, maintenance crews, electricians and other support tradesmen. All new mining data is recorded in the company’s data base on a daily and weekly basis.


Mining Methods

  • Shrinkage stoping
  • Room-and-pillar


Summary:

The Co-O Mine is a shaft access, underground track mine, utilising battery powered locomotives and mine cars. Air-leg mining is used to extract the ore and waste is hauled to surface via the main L8 Production Shaft, two 60- degree inclined shafts; Baguio and Agsao, and through the original portals.

There are 4 winzes operating between Level 8 and Level 9 with three of these also servicing Level 10. Another winze, the 35E internal shaft, is being developed from Level 8 to service Levels 9, 10, 11 and 12. When complete the other winzes will be systematically deepened to also service Levels 11 and 12. The

E15 Shaft, a man and materials shaft, was completed in November 2018. The shaft is used for transporting people and materials underground enabling increased utilisation of the L8 Shaft for hoisting of ore.

As Ore Reserves are diminished from the upper levels, the utilisations of the Portals, Agsao and Baguio shafts for hoisting of ore will reduce partially offsetting the increased skipping expected from L8 Shaft.

Two mining methods are currently utilised at the Co-O Mine:

Shrink stope mining is predominantly used on steeply dipping veins with a minimum mining width of 1.25 metres. Mining commences from the bottom and progresses upwards and the broken ore is left in the stope to provide ground support. The volume of ore expands after blasting by about 30% and this material needs to be progressively drawn from the stope during operation. Once blasting has reached the crown pillar, the remaining 70% of ore can be drawn quickly at low cost.

Room and pillar (slot) mining is used on the low-angle veins where the ore would not naturally flow to the draw points. The broken ore needs to be scraped to the haulage Level by mechanical slushers, and pillars need to be left behind for ground support. The minimum mining width for low angle veins is 1.5 metres, hence the higher dilution is partly responsible for the overall lower than average grade achieved from the upper parts of the mine where the low angle veins are prominent. The ratio of room and pillar stopes to shrink stopes will likely decrease with depth.


Crushing and Grinding


Processing

  • Gravity separation
  • Concentrate leach
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The Co-O Processing Plant is a conventional gold mill, comprising a single stage jaw crusher, SAG mill and conventional CIL circuit, with a gravity gold & intense cyanide leach system. Tailings are treated and thickened before discharge to a multicelled tails storage facility.

The processing plant is powered from the regional grid, but also has its own dedicated gensets that can run the plant at full capacity if required. The majority of the power is from the area grid. The Co-O Mill performed efficiently throughout the fiscal year with mill recovery being increased to 94.3%, with head grades of 5.33 g/t.

Mill throughputs was restricted by availability of ore from the mine, resulting in low utilisation of the processing plant. Optimisation of processing plant operation and maintenance resulted to reduced cost for contract labour for mill relines and major shutdowns as these were completed by on site personnel during scheduled down time.

Low processing p ........

Recoveries & Grades:

CommodityParameter201920182017201620152014
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 6.286.335.336.45.614.76
Subscription required - Subscription is required.

Production:

CommodityUnits202020192018201720162015
Gold oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required80,743108,57898,359
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics201920182017201620152014
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required623,659 wmt659,495 wmt521,899 wmt
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required561,192 dmt582,311 dmt460,004 dmt
Subscription required - Subscription is required.

Reserves at December 31, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 324,000 t Gold 7.25 g/t 75,000 oz
Probable 1,324,000 t Gold 6.03 g/t 257,000 oz
Proven & Probable 1,648,000 t Gold 6.27 g/t 332,000 oz
Measured 418,000 t Gold 9.33 g/t 125,000 oz
Indicated 1,121,000 t Gold 10.75 g/t 387,000 oz
Measured & Indicated 1,539,000 t Gold 10.36 g/t 513,000 oz
Inferred 938,000 t Gold 9 g/t 271,000 oz
Total Resource 2,477,000 t Gold 9.85 g/t 784,000 oz

Commodity Production Costs:

CommodityUnits2020201920182017201620152014
Cash costs Gold USD  ......  Subscription required  ......  Subscription required 595 / oz 466 / oz 385 / oz 418 / oz
All-in sustaining costs (AISC) Gold USD  ......  Subscription required ^  ......  Subscription required  ......  Subscription required 1,374 / oz 999 / oz
^ Guidance / Forecast.
Subscription required - Subscription is required.

Financials:

Units201920182017201620152014
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 123   84.2  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -218.11   30.9  
EBITDA M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -186.8   48.3  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 10, 2020
....................... Subscription required ....................... Subscription required Subscription required Apr 10, 2020
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2019
Subscription required 2018
Subscription required 2017
Subscription required 2016
Subscription required 2015

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
Annual Report 2017
Annual Report 2016
Corporate Presentation 2016
Annual Report 2015
Technical Report 2010
Subscription required - Subscription is required.

Aerial view:

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