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Philippines
Siana Mine

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 Location:
47 km N from Cabadbaran, Philippines

  Address:
Barangay Cawilan, Tubod, Surigao del Norte
Philippines
Phone  ...  Subscription required
Fax+63-2-807-6658
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StatusCare and Maintenance
Mine TypeOpen Pit / Underground
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Processing
  • Gravity separation
  • Agitated tank (VAT) leaching
  • Concentrate leach
  • Carbon in leach (CIL)
  • Carbon adsorption-desorption-recovery (ADR)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life9 years (as of Jan 1, 2017)
Mining operations at the Siana gold project in the Philippines remained suspended pending an improvement in operating conditions in the Philippines. Ongoing activities at Siana include dewatering of the open pit, infrastructure maintenance and monitoring of geotechnical issues.


Owners

Source: p. 2, 19
CompanyInterestOwnership
Red 5 Ltd. 40 % Indirect
Through its Philippine-affiliated company Greenstone Resources Corporation, the Red 5 Group holds an interest in the Siana Gold Project, located on the island of Mindanao in the Philippines.

Deposit Type

  • Epithermal
  • Breccia pipe / Stockwork


Summary:

The Siana gold (silver-lead-zinc) mineralisation is characterised as a high sulphidation regime of epithermal affiliation, hosted predominantly within tectonised volcano clastics altered carbonate and basaltic lithological assemblages.

The mineralization at Siana occurs over broad widths (up to 80m in the central carbonate zone) but the deposit envelope is orientated approximately northsouth.

The mineralisation at Siana is controlled by lithology, structure and breccias and changes in wall rock alteration and ore mineralogy with depth.

In cross section, the central carbonate breccia varies between 20m to 80m in width below the current open pit floor (the main ore zone). Adjacent and west, the volcaniclastic sediments are often bleached and carbonate altered, and host some economic gold mineralisation. Distal chlorite altered sediments are barren. The basalt hosted mineralisation to the east occurs in numerous discrete soft, bleached, pyritic alteration zones, often 10m or more in width, over a lateral distance of approximately 140 metres. Hard fresh basalt between the lodes is barren. Mineralisation progressively narrows to the north and south in both the carbonate and basalt hosts, but is known to persist to approximately 400m below surface, but narrowing. The mineralisation is generally is sub vertical to steeply dipping to the east at approximately -70 degrees. The main mineralised zone strikes N-S to NNW-SSE and also trends to the NE in the northern section of the resource. The Siana resource has a strike length of approximately 500 metres with mineralisation down to approximately 500 metres below surface.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The operation is mined using conventional open pit mining methods using top hammer drill rigs, CAT 40 tonne articulated dump trucks and CAT 374 (~80 t) hydraulic excavators. Mining bench heights are 5 m with mining generally conducted on 2 x 2.5 m flitches. The mining rate is a nominal 8,000 bcm/d.

Mining and processing activities at Siana were suspended in April 2017 pending an improvement in operating conditions in the Philippines. [2019, AR, p.15]

Before the suspension, the deposit was mined by open pit methods, with a plan to transition to underground mining following completion of the open pit. Underground mine development has commenced, with 445m of development completed, three portals and establishment of several critical surface infrastructures to the mine.


Crushing and Grinding


Processing

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

Source: Subscription required

Summary:

The dominant mineralisation for the Siana Mineralisation is gold and silver with the gold to silver ratios from less than 1:1 to silver being greater than 7:1. Material mined from Siana open pit is process on site at the Siana CIL Gold processing plant. Design capacity is 1.1 Mtpa. Processing recoveries for gold vary between 75 to 85% for gold and nominally 40 to 45% for silver. Product produced is a gold/silver dore as bullion.

The plant comprises single stage crushing, SAG milling, gravity concentration and high intensity cyanidation, leaching and adsorption (CIL), followed by carbon elution and electrowinning to produce combined gold and silver doré. The tailings from the cyanide leach area are treated in a detoxification circuit to minimize cyanide concentration prior to discharge to the tailings storage facility. The plant design also includes various reagent mixing facilities as well as water, air and electrical services. The plant uses well-tested technology.

Recoveries & Grades:

CommodityParameter20172016
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 2.73.2
Silver Recovery Rate, %  ......  Subscription required  ......  Subscription required
Silver Head Grade, g/t 7.16.7
Subscription required - Subscription is required.

Production:

CommodityUnits20172016
Gold oz 41,37059,663
Silver oz  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in doré.

Operational Metrics:

Metrics201720162015
Ore tonnes mined  ......  Subscription required786,000 t
Waste  ......  Subscription required3,258,000 bcm
Tonnes processed  ......  Subscription required692,384 t
Daily mining rate  ......  Subscription required8,000 bcm
Plant annual capacity  ......  Subscription required1.1 Mt

Reserves at June 30, 2019:

CategoryOreTypeTonnage CommodityGradeContained Metal
Probable In-Situ (OP) 290 kt Gold 1.1 g/t 10 koz
Probable In-Situ (UG) 3,010 kt Gold 4.1 g/t 396 koz
Probable In-Situ (OP) 3,010 kt Silver 6.6 g/t 61 koz
Probable In-Situ (UG) 3,010 kt Silver 6.7 g/t 644 koz
Indicated In-Situ (UG) 3,400 kt Gold 5.2 g/t 566 koz
Indicated In-Situ (UG) 3,400 kt Silver 7.2 g/t 779 koz
Indicated In-Situ (OP) 650 kt Gold 3.7 g/t 77 koz
Indicated In-Situ (OP) 650 kt Silver 7.9 g/t 164 koz
Inferred In-Situ (UG) 500 kt Gold 9.3 g/t 153 koz
Inferred In-Situ (UG) 500 kt Silver 11.2 g/t 186 koz
Inferred In-Situ (OP) 30 kt Gold 2.8 g/t 3 koz
Inferred In-Situ (OP) 30 kt Silver 1.2 g/t 1 koz
Total Resource In-Situ (OP) 970 kt Gold 2.9 g/t 90 koz
Total Resource In-Situ (UG) 3,900 kt Gold 5.7 g/t 719 koz
Total Resource In-Situ (OP) 970 kt Silver 7.3 g/t 226 koz
Total Resource In-Situ (UG) 3,900 kt Silver 7.7 g/t 964 koz

Operating Costs:

Units20172016
Processing costs ($/t milled) AUD 2628

Financials:

Units20172016
Revenue M AUD  ......  Subscription required  ......  Subscription required
Gross profit M AUD  ......  Subscription required  ......  Subscription required
Pre-tax Income M AUD  ......  Subscription required  ......  Subscription required


Heavy Mobile Equipment as of August 24, 2015:
HME TypeModelSize
Excavator ....................... Subscription required 80 t
Truck (dump) 40 t
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 4, 2020
....................... Subscription required ....................... Subscription required Subscription required Sep 4, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
Annual Report 2017
Press Release 2017
Other 2016
Operations & Technical Update 2015
Subscription required - Subscription is required.

Aerial view:

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