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Malaysia
Selinsing Mine (Selinsing Sulphide Project)

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 Location:
30 km NW from Kuala Lipis, Malaysia

  Address:
157, Jalan Bukit Bius
Kuala Lipis
Malaysia
27200
Phone  ...  Subscription required
Fax60-09-340 2043
WebsiteWeb
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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
Mining Method
  • Truck & Shovel / Loader
Processing
  • Gravity separation
  • ACACIA reactor
  • Concentrate leach
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Elution
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life6 years (as of Jan 1, 2019)
The Selinsing mine is currently transitioning and aims to convert the oxide gold treatment plant to a sulphide gold treatment plant.

The Selinsing Gold Mine Project (SGM) will continue to mine and process oxide material as well as process stockpile and Old Tailings material until the Selinsing Gold Sulphide Project (SGSP) production commences, when extraction of the available gold sulphide economic Mineral Resource at the SGM will commence. All remaining CIL only treatable stockpiles and Old Tailings will then be treated at the end of mine life.
Latest NewsMonument Reports Fourth Quarter and Fiscal 2020 Results     September 15, 2020


Owners

Source: p. 1
CompanyInterestOwnership
Selinsing Gold Mine Manager Sdn. Bhd. 100 % Direct
Monument Mining Ltd. 100 % Indirect
Monument Mining owns 100% interest in the Selinsing Gold Mine through it's wholly owned subsidiary Selinsing Gold Mine Manager Sdn. Bhd. (SGMM).

Deposit Type

  • Breccia pipe / Stockwork
  • Vein / narrow vein
  • Mesothermal


Summary:

The Buffalo Reef and Selinsing gold deposits are thought to be mesothermal lode gold deposits, with auriferous quartz-pyrite-arsenopyrite±stibnite veining, with associated hydrothermal alteration. The two deposits are structurally controlled and thought to be part of the same structural trend, with the Buffalo Reef deposit occurring along strike and to the north of the Selinsing deposit.

The Selinsing gold deposit is hosted by a 20 m to 100 m thick shear zone that dips 55° to 75° towards mine grid east (082° true grid). This zone or “envelope” of sheared rocks has been variably mineralised and intruded by gold-bearing quartz veins and stockworks. The quartz veins are likely to have been emplaced along fault surfaces, which are thought to be reverse thrusts caused by compression from the east. Strike-slip movement is not thought to be significant; however, a north-westerly trending structure, which post-dates the gold mineralisation, has been identified and may have a strike-slip component. The host rocks for the Selinsing shear zone consist of a series of finely interbedded argillites and very fine-grained arenites, along with sequences of quartz-rich, variably silicified sediments of likely tuffaceous origin, which are referred to as “felsic tuff” and a few thin beds of quartzite conglomerate. These host rocks are collectively known as “the mine sequence series”.

The mine sequence sediments are deep marine epiclastic sediments, originally laid down in low- energy conditions and are thought likely to be of volcanogenic origin. The mine sequence has undergone low-grade regional Greenschist facies metamorphism, which is seen by the development of chlorite in some of the host rocks, more notably the felsic volcanic rocks.

The true thickness of the mine sequence is not well understood. One interpretation is that the mine sequence has a true thickness of about 200 m; however, the footwall contact is not well defined and it is difficult to distinguish between the mine sequences in the field due to the fine -grained nature of the host rocks. A second interpretation is that within the shear zone, repetition of these units by shearing creates a structural thickening of the sequence.

The hangingwall rocks at Selinsing are a distinctive sequence of predominantly competent, well- bedded, dark-coloured limestones. Towards the base of the limestones is a narrow unit of black, well-bedded carbonaceous shales, which may be calcareous in places. The contact of these hangingwall units with the mine sequence below is thought to be a tectonic or faulted contact due to the unconformable nature of the bedding on either side of the contact. The contact itself is characterised by large water-filled clay-lined cavities. The footwall contact of the mine sequence is poorly understood as the base of the mine sequence has not been extensively explored. However, the footwall rocks consist of the same type of grey-black limestone as found in the hangingwall and it is thought that the footwall rocks are the same as the hangingwall, repeated due to faulting. This would mean that the less competent mine sequence rocks were more deformed by shearing due to rheological contrasts between the limestones and the argillites and arenites. The hangingwall limestones have locally-developed folding resulting from easterly compression.

The gold mineralisation at Selinsing is hosted within a shear zone that strikes at 350° and dips 60° to 70° to the east, with the higher grade mineralised shoots within the main mineralised shear plunging to the southeast. The main shear zone is hosted within a sequence of felsic tuff and very fine clastic argillite with calcareous material and limestone in the hangingwall. High grade mineralisation is often associated with quartz stockworks and quartz-carbonate veins within highly deformed sedimentary rocks. Pressure and temperature studies on fluid inclusions in quartz from veins suggest that the mineralisation formed at a temperature in the order of 200°C to 350°C and at a depth of between 2 km and 5 km (Makoundi, 2011).

The gold at Selinsing is generally in the form of fine grained gold particles (<20 µm) commonly associated with pyrite and arsenopyrite and rarely with chalcopyrite. Visible (mm-scale) gold, although not common, occurs in quartz veins within the shear zone. The higher grade quartz veins can be over a metre in true thickness and have been traced up to 300 m along strike and 200 m down dip. Lower grade gold mineralisation occurs as finely disseminated gold within intensely deformed envelopes around the quartz veins within the shear zone. Disseminated pyritisation also occurs within the deformed country rock within the shear zone, with the presence of euhedral arsenopyrite as a good indicator of elevated gold grades.

The Buffalo Reef deposit occurs approximately 1 km to the east of the Raub-Bentong suture. The area is dominated by argillite and limestone of Permian age to the east, with conglomerates and sandstones of Devonian age to the west. Low grade regional metamorphism up to Greenschist facies (locally up to Amphibolite facies) occurs throughout the area (Naidu, 2005). The sediments have subsequently been intruded by granitic bodies of approximately Jurassic age. These intrusive bodies occur to the east of Buffalo Reef and generally form elevation highs.

The dominant structural feature present is a 200 m wide, north-south striking shear zone, with an apparent sinistral sense of displacement, which parallels the tectonic Raub-Bentong suture to the west. The shear zone is composed of graphitic shale with minor interbedded fine-grained sandstone and tuffaceous rock (Naidu, 2005). Bedding within the sediments typically dips 65° to 75° to the east and strikes towards a bearing of 330° to 360° (Flindell et al., 2003).

Gold mineralisation at Buffalo Reef is structurally controlled and associated with Permian sediments within a 200 m wide shear zone that parallels the north-south trending Raub-Bentong suture. Mineralisation occurs over a total strike length of approximately 2.6 km. Rocks within the Buffalo Reef shear zone have typically undergone silica-sericite-pyrite alteration to varying degrees (Flindell et al., 2003).

The gold occurs within moderately to steeply east-dipping veins and fracture zones, which range in thickness from 1 m up to 15 m in thickness (average thickness is approximately 10 m in the main mineralised veins), although local flexures in the veins can host mineralisation up to 25 m in thickness. Veins, which are boudinaged in some areas, are generally composed of massive quartz with 1% to 5% (by volume) sulphide minerals, namely pyrite and arsenopyrite, along with varying amounts of stibnite. The stibnite generally occurs in association with elevated gold grades; however, the presence of gold does not necessarily indicate high stibnite levels (i.e. the stibnite tends to be associated with gold, rather than the gold being associated with stibnite).


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Selinsing operation consists of:
• Selinsing Gold Mine
• Buffalo Reef Project
• Exploration leases and blocks.

Historical mining of visible gold at Selinsing by crude means probably occurred for centuries prior to 1888, when British companies began production on a larger scale utilising machinery for primary processing treatment, with intermittent mining continuing at Selinsing up until June 2007 when Monument acquired the Selinsing Project. Mining was restarted in July 2009.

Open pit mining commenced at Buffalo Reef in 2012 and uses the same mining contractor as for the Selinsing Pit. To date the majority of mining and ore treatment history has been associated with oxide material but at the Selinsing and Buffalo Reef deposits an extensive gold sulphide ore deposit remains in fresh and transitional material yet to be mined and treated.

The mining method is conventional open pit drill and blast, load and haul on a 2.5 m mining flitch with a 10 m high blasting bench, reflective of semi-selective mining. The maximum excavator bucket size of 2.3 m3 is matched to this selectivity.

Open pit mining at both Selinsing and Buffalo Reef has historically been carried out by a local contractor Minetech Construction Sdn Bhd (Minetech). who has been involved in the operation since Monument acquired the operation.

The contract is current, and Minetech is responsible for the mining of ore and waste including:
• Drill and blast activities
• Load and haul activities
• Rehabilitation activities.

The current assessment of the contractor facilities is unchanged, and the hard stand provides for the repair and maintenance of the contractor’s fleet consisting of:
18 haul trucks ranging from 20 t to 80 t capacity
9 excavators ranging in bucket capacity from 1.5 m 3 to 3.2 m 3
Various ancillary equipment such as water bowsers, compactors, dozers, graders and light personnel carriers.

The Selinsing and Buffalo Reef deposits are surface outcropping deposits with near surface oxide material suitable for gravity and CIL processing. As such, open pit mining has been carried out for some nine years mining economic oxide material generally above 0.5 g/t Au but considerable material below this grade has also been mined and stockpiled.

The Selinsing deposit is largely sub-vertical dipping and is hosted by a 20–100 m thick shear zone that dips 55° to 75° towards mine grid east (082° true grid).

Mining at Selinsing is more advanced than at Buffalo Reef and has occurred initially as one pit, then as depth increased, twin open pit mining developed in Pit 4 and Pit 5. In both Selinsing open pit areas, oxide mining is largely complete, leaving mainly transition and fresh material to mine.

Mining at Buffalo Reef has occurred since 2012, again mining oxide gravity and CIL treatable material following a pit limit. There are two main areas of Buffalo Reef comprising of:
* Buffalo Reef South (BRS C2, C3 and C4) includes material in several tenements:
- Block 7 (tenement yet to be titled but now acquired by Monument)
- Damar Buffalo Reef South (tenement MC1/111)
- Damar Buffalo Reef Central (tenement ML12/2012).
* Buffalo Reef North (BRN).

Mining of BRS currently consists of several pit areas:
BRS C2 – Buffalo Reef southern area
BRS C3 and 4 – Buffalo Reef central area.
Mining to date has generally been via small pits influenced by surface topography, with the largest pit developed to date being BRC2.

Unlike the Selinsing area, Buffalo Reef is considered tabular and at BRS ore occurs in a main tabular mineralised zone which is typically 10–20 m thick, along with numerous minor sub-parallel mineralised structures. At BRN, the mineralisation is less continuous and narrower when compared to BRS.

There is significant exploration potential at the Selinsing Gold Mine Project with the sulphide orebodies open at all directions allowing for potential in both open pit and underground mining. Currently, there is no plan for any underground operations. In order to progress the operation through to sulphide ore production the Selinsing Gold Sulphide Processing Project (SGSP) has been initiated.


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher ....................... Subscription required 42" x 30" 90 kW 1
Cone crusher ....................... Subscription required 220 kW 1
Cone crusher ....................... Subscription required 160 kW 1
Ball mill 4.2m x 5.2m 1600 kW 1
Ball mill 3.2m x 4m 650 kW 1

Summary:

The existing comminution circuit comprises primary, secondary and tertiary crushing, with two stages of ball milling operating in closed circuit with current throughput of approximately 3,000 t/d.

Orway Mineral Consultants (OMC) report describes the specifications of the existing crushing equipment.

Orway Mineral Consultants (OMC) carried out a mill assessment to estimate the maximum grinding power available. The pinion power is the estimated power draw at the mill shell. This value is approximately 7.5% lower than the motor power input due to drive train losses. Based on the OMC (Feb 2018) ball mill power model, the maximum pinion power available from the two ball mills is 1,830 kW (i.e. 1,330 kW from primary mill and 500 kW from secondary mill).

Based on the mill feed size F80 of 8.0 mm, a milling rate in the range of 88–118 tonnes per hour (t/hr) can be expected when processing these materials while still maintaining the target grind P80 of 75 µm.


Processing

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

Flow Sheet: Subscription required

Summary:

The existing 3,000 t/d oxide plant consists of three-stage crushing, a 5,000-t surge capacity crushed ore stockpile (COS) stockpile reclaimed to primary and secondary ball mills in series followed by gravity separation and a CIL circuit. Tails are discharged to the TSF and surplus process water detoxified and discharged to a series of polishing ponds.

The Selinsing operation has now limited supply of gold-bearing material that can be processed by the current oxide plant. Currently, the plant processes oxide ore, tailings and leachable sulphide ore.

Progressing to a stage of sulphide ore process capability in a timely manner is now of the utmost
concern. In order to progress the operation through to sulphide ore production the Selinsing Gold Sulphide Processing Project (SGSP) has been initiated.

The Feasibility Study for the Selinsing Gold Sulphide Project was released in February 2019 and describes adding flotation and BIOX® processes to the curre ........

Recoveries & Grades:

CommodityParameter2020201920182017201620152014
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 1.110.81.030.80.881.451.31
Subscription required - Subscription is required.

Production:

CommodityUnits202020192018201720162015
Gold oz  ......  Subscription required  ......  Subscription required  ......  Subscription required12,84518,15536,473
All production numbers are expressed as payable metal.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018201720162015
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required423,011 t421,845 t
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required2,489,500 t3,196,553 t
Stripping / waste ratio  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required5.89 7.58
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required992,070 t954,165 t
Annual processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Daily processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required3,000 t
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Reserves at March 31, 2018:
MINERAL RESERVES: for OXIDE - above approx. 0.4 g/t Au cut-off, for TRANSITION - above approx. 0.75 g/t Au cut-off, for SULPHIDE - above approx. 0.75 g/t Au cut-off.
MINERAL RESOURCES: for OXIDE - above 0.3 g/t Au cut-off, for TRANSITION - above 0.5 g/t Au cut-off, for SULPHIDE - above 0.5 g/t Au cut-off.

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven Mill / Sulphide 45 kt Gold 1.53 g/t 2 koz
Proven Oxide 1,265 kt Gold 0.47 g/t 19 koz
Proven Total 1,310 kt Gold 0.51 g/t 21 koz
Probable Mill / Sulphide 2,680 kt Gold 2.03 g/t 175.1 koz
Probable Transitional sulphide 757 kt Gold 1.72 g/t 41.9 koz
Probable Oxide 991 kt Gold 0.91 g/t 29 koz
Probable Total 4,428 kt Gold 1.73 g/t 246 koz
Proven & Probable Mill / Sulphide 2,725 kt Gold 2.02 g/t 177 koz
Proven & Probable Transitional sulphide 757 kt Gold 1.72 g/t 42 koz
Proven & Probable Oxide 2,256 kt Gold 0.67 g/t 48 koz
Proven & Probable Total 5,738 kt Gold 1.45 g/t 267 koz
Measured & Indicated Mill / Sulphide 8,097 kt Gold 1.6 g/t 417 koz
Measured & Indicated Transitional sulphide 1,086 kt Gold 1.49 g/t 52 koz
Measured & Indicated Oxide 2,798 kt Gold 0.68 g/t 61 koz
Measured & Indicated Total 11,981 kt Gold 1.38 g/t 530 koz
Inferred Mill / Sulphide 5,563 kt Gold 1.79 g/t 319 koz
Inferred Oxide 349 kt Gold 1.05 g/t 11.8 koz
Inferred Transitional sulphide 485 kt Gold 1.22 g/t 19 koz
Inferred Total 6,397 kt Gold 1.7 g/t 350 koz

Commodity Production Costs:

CommodityUnits20202019201820172016
Total cash costs Gold USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 936 / oz† 606 / oz†
All-in sustaining costs (AISC) Gold USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units20202019201820172016
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Sales margin M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required


Heavy Mobile Equipment as of January 31, 2019:
HME TypeQuantityLeased or
Contractor
Excavator 9 Leased
Truck (haul) 18 Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 25, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 25, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 25, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 25, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 25, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 25, 2021
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2020

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
Annual Report 2017
Management Discussion & Analysis 2017
Technical Report 2016
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News:

NewsDate
Monument Reports Fourth Quarter and Fiscal 2020 Results September 15, 2020
Monument Permitted to Operate During MCO Period at the Selinsing Gold Mine in Malaysia May 1, 2020
Monument Announced Extension to Movement Control Order In Malaysia March 31, 2020
Monument Announces Drill Program Results at Selinsing Gold Mine Pit 4 November 8, 2019

Aerial view:

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