Overview
Stage | Construction |
Mine Type | Underground |
Commodities |
|
Mining Method |
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Production Start | ... |
Mine Life | 28 years (as of Jan 1, 2022) |
The Silangan Project is seen as one of the current three large-scale projects in the country to become a major copper and gold producer. Its tenements consist of two main ore deposits: Boyongan and Bayugo.
Boyongan ore deposit will be developed as Phase I of the Silangan Project. Bayugo ore deposit to be developed as Phase II, with Bayugo-Silangan deposit (Phase II-A) and Bayugo-Kalayaan deposit (Phase II-B).
The Front End Engineering and Design (FEED) works for the mine, process plant and tailings storage facility were completed by the third quarter of 2022. Earth works, slope stabilization, and excavation for the boxcut and portal commenced in May 2022 and was completed by January 2023. |
Source:
p. 6
The Silangan Project tenements consist of two main ore deposits: Boyongan and Bayugo.
Boyongan ore deposit is wholly owned by Silangan Mindanao Mining Co., Inc. (SMMCI).
Bayugo ore deposit: Bayugo-Silangan deposit is wholly owned by SMMCI, Bayugo-Kalayaan deposit is a joint venture with Manila Mining Corporation, its subsidiary Kalayaan Copper Gold Resources, Inc. (KCGRI), and Philex Mining which currently holds a 5% interest with an option to increase its stake up to 60%.
Philex Mining Corp. (PMC) owns 100% stake in SMMCI.
Contractors
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Deposit Type
- Vein / narrow vein
- 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 ........
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 ........
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Flow Sheet:
Summary:
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Pipelines and Water Supply
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Reserves at January 10, 2022:
Cut-off grade: 0.548 % CuEq.
Mineral Resources are reported inclusive of Mineral Reserves.
Category | Tonnage | Commodity | Grade | Contained Metal | Recoverable 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
|
|
Corporate Filings & Presentations:
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