Overview
| Stage | Preliminary Economic Assessment |
| Mine Type | Underground |
| Commodities |
|
| Mining Method |
- Longhole stoping
- Paste backfill
|
| Mine Life | 10 years (as of Jan 1, 2022) |
Source:
p. 4
The Antler Deposit outcrops over 750m of strike within two patented mining claims. One of New World’s US-subsidiaries owns a 100% interest in these two patented claims (that cover a total of 40 acres) – where both the surface rights and the mineral rights are privately-owned. New World also holds a 100% interest in an additional 81 unpatented mining claims on adjoining federal lands (covering 1,365 acres), where mineral exploration and mining is overseen by the Bureau of Land Management (“BLM”).
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Summary:
The Antler Deposit is a high-grade, polymetallic, volcanogenic massive-sulphide (VMS) Cu-Zn-Pb-Ag-Au deposit. Mineralisation outcrops at surface over 750m of strike. The Deposit dips to the west- northwest at around 60 degrees.
While mineralisation is laterally and vertically continuous over the 500m of strike that has been drill-tested to date, to depths >700m, several thicker, steeply plunging “shoots” of high-grade mineralisation are evident. This thickening is interpreted to be due to structural repetition – primarily folding; while faults may also locally control thicker mineralisation.
Copper is the most valuable metal present, but it is anticipated that significant revenue will also be derived from zinc, silver, lead and gold.
Mining Methods
- Longhole stoping
- Paste backfill
Summary:
New World has made the deliberate decision to pursue underground-only mining operations at Antler (i.e., with no starter open-pit). This development approach will minimise the Project’s surface footprint, thereby minimising its impact on the environment and the local community.
An additional benefit of this approach is that all surface disturbances are likely to be constrained to privately owned land, which is expected to help streamline the mine permit approval process.
The preliminary mine design contemplates developing a single 5.0m x 5.0m decline. Long-hole stoping with paste fill would then be utilised to extract 7.3Mt of the 7.7Mt November 2021 Resource. The very high (95%) recovery rate is attributable to (i) the consistently high grades of the mineralisation at the Antler Project; and (ii) the lateral and vertical continuity of the mineralisation.
Longhole stoping with paste backfill has been selected as the primary mining method. The stopes are to be mined in a longitudinal sequence retreating from hangingwall to footwall.
Ultimately a NSR cut-off of $70/t with 25m-high stopes was selected as the base case scenario, as MSO runs with higher NSR values tended to pull in excessive amounts of waste, especially when two parallel mineralized lodes were present.
Minimum and maximum stope widths of 2.5m of 20.0m, respectively, were ascribed.
An additional 2.0Mt of material would be mined through dilution – res ........
Source:
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Flow Sheet:
Summary:
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Reserves at November 5, 2021:
Mineral Resource Estimate for the Antler Copper Deposit above a 1.0% Cu-Equivalent cut-off grade.
| Category | Tonnage | Commodity | Grade |
|
Total Resource
|
7,723,280 t
|
Copper
|
2.23 %
|
|
Total Resource
|
7,723,280 t
|
Zinc
|
5.32 %
|
|
Total Resource
|
7,723,280 t
|
Lead
|
0.9 %
|
|
Total Resource
|
7,723,280 t
|
Silver
|
28.8 g/t
|
|
Total Resource
|
7,723,280 t
|
Gold
|
0.18 g/t
|
|
Total Resource
|
7,723,280 t
|
Copper Equivalent
|
3.9 %
|
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