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Philippines
Silangan Project

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 Location:
30 km N from Surigao del Norte, Philippines

  Project Contacts:
2nd Floor, LaunchPad Reliance Street corner Sheridan Street
Mandaluyong
Philippines
1550
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Overview

StagePermitting
Mine TypeUnderground
Commodities
  • Copper
  • Gold
  • Silver
Mining Method
  • Sub-level caving
Production Start...
Mine Life28 years (as of Jan 1, 2022)
The Silangan Project, located in Surigao del Norte, consists of two deposits – Boyongan and Bayugo.


Owners

Source: p. 11
CompanyInterestOwnership
Philex Mining Corp. 100 % Indirect
The Silangan project is owned and being operated by Silangan Mindanao Mining Company (SMMCI). Philex Mining Corp. (PMC) owns 100% stake in SMMCI.

Contractors

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Deposit Type

  • Porphyry
  • Breccia pipe / Stockwork


Summary:

In the Silangan region, intrusions of andesite porphyry and dioritic plutons are widespread. Dating by ANU-PRISE (ANU-Prise is an externally funded group within the Research School of Earth Sciences at the Australian National University) for Anglo returned mid to late-Pliocene ages for most altered or mineralised intrusions (Anglo 2008a). The majority of intrusions from the Pacific Cordillera exhibit andesitic to trachyandesitic compositions, but also include a relatively minor component of basaltic andesites, dacites and monzonites of calc-alkaline and high-K calc-alkaline affinity.

Porphyry intrusions commonly occur as plugs, dykes and sills of hornblende andesite porphyry, generally within a 20 km wide belt, which includes the majority of the known epithermal gold and copper-gold porphyry deposits and prospects. The igneous activity is closely related to splays off the Philippine Fault, probably because the fault exploited hotter rocks along the axial zone of the magmatic arc (Anglo 2008a).

Intrusive clusters occur along major structural lineaments and at the intersection of lineaments. The Maniayao Highlands immediately north of Lake Mainit forms the largest igneous complex in the Surigao District and is situated in an area of maximum extension within a pull-apart basin. Other clusters of intrusive rocks in the area tend to comprise of five to ten individual intrusions occurring as individual conical hills. There are several such clusters in the Suri ........


Mining Methods

  • Sub-level caving


Summary:

Selection of mining method for Boyongan deposit is limited to underground methods because of the current regulatory environment. Porphyry deposits can most economically be mined using caving techniques. For Boyongan, a sub-level cave mining operation was designed, which has a number of advantages over block cave mining.

Sub-level cave mining method to mine the Boyongan orebody was selected on account of the following.
1. Further scrutiny identified higher-grade portions of the Boyongan orebody are located at higher elevations such that a top-down mining approach is expected to provide better economic results.
2. Faster development rate as the initial production level is developed at the upper portions of the orebody versus developing the production level at the bottom of the orebody in a Block cave mine.
3. Streamlined the metallurgical process as the initial ore mined at the first two years of operations are purely oxide ore which will require copper and gold leaching process only. The copper flotation plant that process sulfide ore will only be required in the third year of operation.

Sub-level cave mining, in principle, is a method that is suitable for moderately fractured ore bodies, which when drilled and blasted will collapse by its own weight thereby creating fragments of rocks that are subsequently extracted. The process consists of driving a series of evenly spaced openings called production drifts in a direction dictated by ........


Crushing and Grinding
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Processing

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Summary:

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Projected Production:

CommodityProductUnitsAvg. AnnualLOM
Copper Metal in concentrate M lbs 247
Copper Cathode M lbs 746
Copper Total M lbs 993
Gold Metal in concentrate koz  ......  Subscription required
Gold Metal in doré koz  ......  Subscription required
Gold Metal in conc./ doré koz  ......  Subscription required
Silver Metal in concentrate koz  ......  Subscription required
Silver Metal in doré koz  ......  Subscription required
Silver Metal in conc./ doré koz  ......  Subscription required
Gold Equivalent Metal in conc./ doré M oz  ......  Subscription required
Copper Equivalent Total M lbs  ......  Subscription required
Silver Equivalent Metal in conc./ doré M oz  ......  Subscription required

Operational Metrics:

Metrics
Daily ore mining rate  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Daily processing capacity  ......  Subscription required
Tonnes processed, LOM  ......  Subscription required
Annual processing capacity  ......  Subscription required
Annual ore mining rate  ......  Subscription required
* According to 2022 study.
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Reserves at January 10, 2022:
Cut-off grade: 0.548 % CuEq.

CategoryTonnage CommodityGradeContained MetalRecoverable Metal
Probable 81,444,208 t Copper 0.67 % k lbs 992,828 k lbs
Probable 81,444,208 t Gold 1.13 g/t oz 2,812,885 oz
Measured 160 Mt Copper 0.58 % 2,039 M lbs
Measured 160 Mt Gold 0.86 g/t 4.43 M oz
Indicated 119 Mt Copper 0.44 % 1,151 M lbs
Indicated 119 Mt Gold 0.48 g/t 1.84 M oz
Inferred 218 Mt Copper 0.36 % 1,735 M lbs
Inferred 218 Mt Gold 0.49 g/t 3.42 M oz
Total Resource 497 Mt Copper 0.45 % 4,925 M lbs
Total Resource 497 Mt Gold 0.61 g/t 9.69 M oz

Commodity Production Costs:

CommodityUnitsAverage
Total cash costs Copper Equivalent USD  ......  Subscription required&nbs
Total cash costs Gold Equivalent USD  ......  Subscription required&nbs
All-in sustaining costs (AISC) Copper Equivalent USD  ......  Subscription required&nbs
All-in sustaining costs (AISC) Gold Equivalent USD  ......  Subscription required&nbs
All-in costs Copper Equivalent USD  ......  Subscription required&nbs
All-in costs Gold Equivalent USD  ......  Subscription required&nbs
Assumed price Copper USD  ......  Subscription required&nbs
Assumed price Silver USD  ......  Subscription required&nbs
Assumed price Gold USD  ......  Subscription required&nbs
* According to 2022 study / presentation.
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Operating Costs:

Units2022
UG mining costs ($/t milled) USD 10.3 *
Processing costs ($/t milled) USD  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2022 study.
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2022 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Closure costs $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
UG OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 1,744
G&A costs $M USD 548
Total OpEx $M USD  ......  Subscription required
Income Taxes $M USD  ......  Subscription required
Total Taxes $M USD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
Net revenue (LOM) $M USD  ......  Subscription required
Operating margin, %  ......  Subscription required
EBITDA (LOM) $M USD  ......  Subscription required
Net Income (LOM) $M USD  ......  Subscription required
After-tax Cash Flow (LOM) $M USD  ......  Subscription required
After-tax NPV @ 8% $M USD  ......  Subscription required
After-tax IRR, %  ......  Subscription required
After-tax payback period, years  ......  Subscription required
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Proposed Heavy Mobile Equipment as of January 10, 2022:
HME TypeModelSizeLeased or
Contractor
Cable bolter ....................... Subscription required Leased
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Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 3, 2022
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Staff:

Total WorkforceYear
Subscription required 2022

Corporate Filings & Presentations:

DocumentYear
Mine Operations Plan 2022
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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