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Australia
Hillgrove Operation

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 Location:
23 km E from Armidale, New South Wales, Australia

  Address:
130 Brackin Street
Hillgrove
New South Wales, Australia
2350
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Financials
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  • Filings & News

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Overview

StatusCare and Maintenance
Mine TypeUnderground
Commodities
  • Gold
  • Antimony
Mining Method
  • Longhole stoping
Production Start...
Mine Life5 years (as of Jan 1, 2020)
Red River has undertaken a detailed review in preparation for the restart of the Hillgrove Gold Project. The outcome of the review was a lean capital efficient staged restart process, with Stage One (processing of Bakers Creek Stockpile) scheduled to commence at the end of CY2020, and Stage Two (full restart of UG mining operations) scheduled to commence at the end of CY2021.

Red River started gold production from the Hillgrove mine’s Bakers Creek stockpile in December 2020 and trucked its first load of gold concentrate from the mine on June 18, 2021.

On September 7, 2022, Red River Resources placed its Hillgrove operation in New South Wales on care and maintenance while it undertakes a detailed study on the options available to it.


Owners

Source: p. 22
CompanyInterestOwnership
Red River Resources Ltd. 100 % Indirect
Red River acquired the Hillgrove Gold Project in August 2019 from a private vendor.

Contractors

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Deposit Type

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


Summary:

The Hillgrove mineralisation can be classified as orogenic style, antimony – gold deposits, that are hosted in a combination of the Mid Carboniferous Girrakool Sediments and Late Carboniferous – Early Permian Granites. The setting is part of the New England Orogen, one of four which formed most of the east coast of Australia. The mineralised zones are structurally controlled within a NW trending shear corridor, formed from the movement of two regional faults (Hillgrove and Chandler). Multi-phase antimony – gold – tungsten mineralisation has been hydrothermally emplaced into narrow shears (0.1 m – 10 m wide), which have good strike and depth extents. Gold mineralisation is predominantly refractory (associated with arsenopyrite), and also occurs as aurostibite in stibnite, and as particle gold.

Mineralised vein and breccia systems at Hillgrove are hosted in biotite-grade metamorphosed sedimentary rocks of the late Palaeozoic Girrakool Beds (originally shale, siltstone, argillite, greywacke), biotite monzogranite (S-type) of the ~300 Ma Hillgrove Adamellite and granodioritic-dioritic rocks of the early Permian Bakers Creek Diorite Complex. The structures and mineralisation post-date, and are unrelated to any of the host rocks. Syn-mineralisation lamprophyre dykes that are both cut by mineralisation as well as having intruded mineralised structures, are dated at 247-255 Ma (Ashley et al., 1994), thus bracketing the potential age of mineralisation to approximately the P ........


Mining Methods

  • Longhole stoping


Summary:

UG Operations will commence in the Metz Mining Centre, allowing Red River to take advantage of the existing UG development & infrastructure to target the high-grade Lode systems (Syndicate, Blacklode & Sunlight).

The Metz Mining Centre is currently on active care & maintenance, with all infrastructure (ventilation, power, water) in place to support near term restart of mining. Previous owners invested significant capital in development the Metz Mining Centre, with approximately 3,950m of declines and capital development, 3,400m of ore drives in the Syndicate Lode, 500m of ore drives in Blacklode and 320m of ore drives in Cox’s Lode.

Mining methods are assumed to be underground long hole stoping techniques on a 20 m level spacing. Minimum mining widths of 1.5 m are expected.


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Production:
Red River commenced processing material from the Hillgrove (Bakers Creek) stockpile in December 2020. The Bakers Creek stockpile was exhausted in Q1 FY22, a small amount of gold was produced from gold-bearing residues for the remainder of the year.

CommodityProductUnits20222021
Gold Concentrate kt  ......  Subscription required  ......  Subscription required
Gold Metal koz  ......  Subscription required  ......  Subscription required

Operational Metrics:

Metrics20222021
Tonnes processed  ......  Subscription required  ......  Subscription required
Annual processing capacity  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Reserves at June 30, 2022:

CategoryTonnage CommodityGradeContained Metal
Measured 442 kt Gold 3.6 g/t 51 koz
Measured 442 kt Antimony 3.8 % 17 kt
Measured 442 kt Gold Equivalent 9 g/t
Indicated 3,766 kt Gold 4.8 g/t 582 koz
Indicated 3,766 kt Antimony 1.3 % 48 kt
Indicated 3,766 kt Gold Equivalent 6.6 g/t
Inferred 3,017 kt Gold 4.2 g/t 404 koz
Inferred 3,017 kt Antimony 0.8 % 25 kt
Inferred 3,017 kt Gold Equivalent 5.3 g/t
Total Resource 7,226 kt Gold 4.5 g/t 1,037 koz
Total Resource 7,226 kt Antimony 1.2 % 90 kt
Total Resource 7,226 kt Gold Equivalent 6.2 g/t

Financials:

Units20222021
Revenue M AUD  ......  Subscription required  ......  Subscription required
EBITDA M AUD  ......  Subscription required  ......  Subscription required
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Heavy Mobile Equipment:
HME TypeModelSizeQuantityRef. Date
Jumbo ....................... Subscription required Sep 19, 2019
Loader ....................... Subscription required ....................... Subscription required Sep 19, 2019
Truck (dump) ....................... Subscription required 40 t ....................... Subscription required Oct 22, 2020
Truck (underground) ....................... Subscription required Sep 19, 2019
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Feb 10, 2023
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2022
Subscription required 2021

Corporate Filings & Presentations:

DocumentYear
Annual Report 2022
Press Release 2022
Quarterly Report 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Other 2006
Subscription required - Subscription is required.

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