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Australia
Penny Mine (Mt Magnet Operation)

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 Location:
407 km E from Geraldton, Western Australia, Australia

  Address:
Level 1, 130 Royal Street
PO Box 6070
Perth
Western Australia, Australia
6892
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
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  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit & Underground
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
  • Longhole stoping
  • Cemented backfill
Processing
  • Centrifugal concentrator
  • Calcining
  • Smelting
  • Intensive Cyanidation Reactor (ICR)
  • Agitated tank (VAT) leaching
  • Concentrate leach
  • Carbon in leach (CIL)
  • Carbon in pulp (CIP)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life3.8 years (as of Jan 1, 2020)
Penny - one of Australia’s highest grade gold mines.

In the March 2021 quarter, works commenced on regulatory approvals, contract negotiations, and the purchase of long lead items. All key approvals were received in the June quarter and accordingly camp construction commenced and the open pit mining and catering contracts were awarded. Open pit mining commenced in the September 2021 quarter before underground development commences in the second half of the 2022 financial year.


Owners

Source: p. 13
CompanyInterestOwnership
Ramelius Resources Ltd. 100 % Indirect
Penny falls within M57/180 & M57/196 owned 100% by Ramelius subsidary Penny Operations Ltd.

Deposit Type

  • Orogenic
  • Vein / narrow vein


Summary:

Penny is an orogenic structurally controlled Archaean gold lode system. Gold mineralisation occurs within narrow, steeply, east dipping, quartzsulphide lodes. The quartz veins are variably massive, laminated or brecciated with a variable sulphide assemblage of pyrite, pyrrhotite, galena, chalcopyrite and sphalerite & frequent VG. High Ag grades (1:1 Au) are noted.

At Penny mineralisation is hosted by a steeply dipping quartz veins within a mafic to intermediate stratigraphy and strongly associated with sulphide mineralisation within the vein.

Penny lodes are a narrow vein/lode style. Penny North strikes N and dips 55° to E. Average width around 2-3m, ranging from 1m to 6m. Strike and dip extent of 250m by 200m. Penny West similar and Magenta & Columbia are much smaller.

Host stratigraphy for the deposit is a sequence of steeply dipping mafic and ultramafic rocks with minor felsic intrusives. Gold mineralisation is associated with steeply east dipping, quartz-sulphide veins typically 2m to 5m in width. These quartz lodes are visually distinct and typically display sharp boundaries to the mineralisation. The quartz veins are variably massive, laminated or brecciated with a highly variable sulphide assemblage of pyrite, pyrrhotite, galena, chalcopyrite and sphalerite. Some sulphide zones are semi-massive and can comprise 50-90% sulphide. Visible gold can be seen proximal to galena and sphalerite. Pb anomalism is significant with lode Pb grade up to 2%. Silver grade is also significantly higher than typical Archaean lode gold deposits.


Mining Methods

  • Truck & Shovel / Loader
  • Longhole stoping
  • Cemented backfill


Summary:

The PFS proposes a partial cutback of the existing Penny West pit to provide a suitable location for the development of the Penny North underground main decline portal and ventilation / egress adits. A small open pit is also planned to be mined on the Magenta lode 1.5 kilometres to the north of the Penny North underground mine subject to the finalisation of the Feasibility Study and final investment decision. Underground development at the Penny Gold Project is scheduled to commence during the 2021 financial year with ore being mined in the 2022 financial year. The mining method consists of a conventional mechanised decline and 20m sub level development. The stoping method is conventional longhole drilling and blasting of up-hole bench stopes with a combination of in-situ pillars and cement rock fill stope support. Ore will be hauled along existing access and government roads to the Mt Magnet plant for processing.

The primary initial focus will be excavation of a 736,000bcm cutback on the existing Penny West pit to facilitate portal development in fresh rock from a position in the pit which is safely accessible. The cutback design incidentally allows recovery of 1,200t @ 15.5g/t of inferred ore.

Penny North Underground Mine and will be accessed from the Penny West Pit and will ultimately be mined to a depth of 180mRL (~315m below surface). Production levels will be spaced 20m floor to floor. Ore drives will be developed to a height of 4.5m, resulting in production drill holes up to 20m in length. All holes are planned to be 76mm up holes.

In order to approach 100% extraction, backfilling of voids will be required. The proposed method is already deployed at the Vivien mine with Cemented Rock Fill (CRF) in every second level. CRF will use development waste material, this material generally has a particle size distribution that provides the fill with the required strength without further crushing or screening. Where possible, development waste rock will be trucked directly to “backfill” stockpiles to limit haulage of waste rock to the surface and back. Using CRF, every second production level (primary level) would be completely backfilled with the intermediate (secondary) levels remaining open with small island pillars left in-situ to provide support to the hanging wall. The Penny West mineralisation left below the pit is generally thinner than Penny North and consequently has not been included in the current mine plan at this stage. Further drilling and evaluation of Penny West is expected during operations.

The underground schedule is based upon a single jumbo developing at a maximum rate of 260m per month and a maximum stoping rate of 11,000t of stope ore per month from a level with each level having 2 production fronts.


Crushing and Grinding


Processing

  • Centrifugal concentrator
  • Calcining
  • Smelting
  • Intensive Cyanidation Reactor (ICR)
  • Agitated tank (VAT) leaching
  • Concentrate leach
  • Carbon in leach (CIL)
  • Carbon in pulp (CIP)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Source: Subscription required

Summary:

It is planned for the Penny Project ore to be processed through the Mt Magnet Processing Plant as part of an overall feed blend. Test work has shown that high metallurgical recoveries can be achieved at the current processing grind size of nominally 175µm.

No capital modifications to the processing facility are required in order to process the Penny gold ores. Penny ores are marginally softer and the gravity circuit has been demonstrated to have a capacity well above the calculated gravity gold recovery in the Penny feed blend, and the overall gold production is below peak gold production.

The Mt Magnet processing plant is a conventional CIL/CIP gold plant with single stage crushing, primary SAG milling in closed-circuit with a pebble crusher, and secondary closed-circuit ball milling.

A centrifugal style gravity gold recovery circuit operates on a portion of the secondary milling product hydrocyclone underflow. Gravity gold concentrate is intensively l ........

CommodityParameter

Production:

CommodityUnitsLOM (Projected)
Gold koz 238
All production numbers are expressed as metal in doré.


Reserves at June 30, 2021:
A maximum A$2,250/oz gold price has been used to estimate Ore Reserves and determine appropriate cut-offs.

CategoryTonnage CommodityGradeContained Metal
Probable 500,000 t Gold 14 g/t 230,000 oz
Indicated 420,000 t Gold 19 g/t 260,000 oz
Inferred 200,000 t Gold 6.6 g/t 42,000 oz
Total Resource 620,000 t Gold 15 g/t 300,000 oz


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 13, 2022
....................... Subscription required ....................... Subscription required Subscription required Jun 13, 2022
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Staff:

EmployeesYear
Subscription required 2021

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
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