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Canada
O’Brien Project

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 Location:
46 km E from Rouyn-Noranda, Quebec, Canada

  Project Contacts:

P.O. Box 307
Rouyn-Noranda
Quebec, Canada
J9X 5C3
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  • Overview
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  • Filings & News

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Overview

StagePreliminary Economic Assessment
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Sub-level stoping
  • Avoca
Mine Life6 years (as of Jan 1, 2015)
O’Brien is one of the highest-grade undeveloped gold projects in Canada/USA

Current Stage: Advanced Exploration
Latest NewsRadisson intersects 10.65 g/t Gold over 4.40 m and 21.84 g/t Au over 2.00 m at 900 m vertical depth along Trend 2     January 24, 2023


Owners

Source: p. 3, 5
CompanyInterestOwnership
Radisson Mining Resources Inc. 100 % Direct
Radisson’s main asset is the 100% owned O’Brien Gold Project (including the O’Brien, Kewagama and New Alger properties).

Contractors

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Deposit Type

  • Vein / narrow vein


Summary:

The property straddles the Piché Group volcanic rocks that separate Pontiac Group metasedimentary rocks to the south from Cadillac Group metasedimentary rocks to the north. In the property area, all lithologies strike east-west and dip steeply south at approximately 85°.

Cadillac Group
The The Cadillac–Larder Lake Fault Zone (CLLFZ) is a major regional crustal break that consists mainly of chlorite-talccarbonate ultramafic schist, and ranges in thickness from 100 to 300 ft (30 to 100 m) in the mine area, and narrows significantly to about 40 ft (12 m) wide to the east of Zone 36 East. Across the property, the fault is subparallel and close to the Piché Group-Cadillac Group contact, but is generally enveloped by Cadillac Group sedimentary rocks (argillites, greywackes and, to a lesser extent, chert).

Piché Group
The veins of the O’Brien Project were mostly injected into the volcanic and sedimentary rocks of the Piché Group. From south to north, the Piché Group stratigraphy is divided into the following units:
• Southern volcanics: tuff and basaltic schists;
• Southern porphyritic andesite;
• Central volcanics: tuff and basaltic schists;
• Sporadically pebbly greywacke and argillite (“Mine Conglomerate”);
• Northern porphyritic andesite;
• Northern volcanics: tuff and mafic schists (with small quantities of argillite, greywacke, chert and massive to variably porphyritic basalt flows).

All the above ........


Mining Methods

  • Sub-level stoping
  • Avoca


Summary:

Due to the narrow vein nature of the orebody, two (2) underground mining methods were considered in the study, modified Avoca and long-hole mining with captive sublevels.

The mineralized material will be transported to surface using a combination of 3.5-cubic-yard to 6-cubic-yard scoop trams and 30-tonne trucks. Waste material will be used to backfill mined out stopes as much as possible or will be brought to surface and stored on a dedicated waste pad.

The current PEA is based on an underground mine with access by decline to a vertical depth of 550 metres in the 36E area and 250 metres in the Kewagama area.

The expected average daily production rate during the production period is estimated in this PEA between 450 and 500 t/day. The overall project mine life is expected to be approximately 6 years, including a two-year pre-production period.

Modified Avoca mining method
The modified Avoca mining method was mostly used in the present study.

The modified Avoca mining method consists of drilling a series of vertical holes downward into mineralization from one level to another. The mineralization is then blasted in vertical slices, and the broken material ends up in the bottom sill and is extracted using LHDs. For every sill and sublevel horizontal slice, a primary slot opened by drop raise method is excavated at each extremity of the level, and blasting of a first stope 18 to 22 metres in length along strike is achiev ........


Crushing and Grinding
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Processing

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Summary:

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Projected Production:

CommodityUnitsLOM
Gold oz 135,308

Operational Metrics:

Metrics
Daily mining rate 500 t *
Waste tonnes, LOM 688,474 t *
Ore tonnes mined, LOM 712,522 t *
Total tonnes mined, LOM 1,400,996 t *
Tonnes milled, LOM 712,522 t *
Daily processing rate 2,400 t *
* According to 2015 study.

Reserves at July 15, 2019:
Mineral Resource Estimate at a 5.0 g/t cut off.

CategoryTonnage CommodityGradeContained Metal
Indicated 949,700 t Gold 9.48 g/t 289,400 oz
Inferred 617,400 t Gold 731 g/t 145,000 oz

Commodity Production Costs:

CommodityAverage
Cash costs Gold 933.18 / oz *  
Total cash costs Gold 939.28 / oz *  
All-in sustaining costs (AISC) Gold 1,096 / oz *  
All-in costs Gold 1,447 / oz *  
Assumed price Gold 1,475 / oz *  USD
* According to 2015 study / presentation.

Operating Costs:

Units2015
UG mining costs ($/t milled) CAD 42.5 *
Processing costs ($/t milled) CAD  ......  Subscription required
G&A ($/t milled) CAD  ......  Subscription required
Total operating costs ($/t milled) CAD  ......  Subscription required
* According to 2015 study.
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2015 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Pre-Production capital costs $M CAD  ......  Subscription required
Sustaining CapEx $M CAD  ......  Subscription required
Closure costs $M CAD  ......  Subscription required
Total CapEx $M CAD  ......  Subscription required
UG OpEx $M CAD  ......  Subscription required
Processing OpEx $M CAD 26.2
G&A costs $M CAD 18.7
Total OpEx $M CAD  ......  Subscription required
Total Taxes $M CAD  ......  Subscription required
Royalty payments $M CAD  ......  Subscription required
Gross revenue (LOM) $M CAD  ......  Subscription required
Net revenue (LOM) $M CAD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M CAD  ......  Subscription required
After-tax Cash Flow (LOM) $M CAD  ......  Subscription required
Pre-tax NPV @ 5% $M CAD  ......  Subscription required
After-tax NPV @ 5% $M CAD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
Pre-tax payback period, years  ......  Subscription required
After-tax payback period, years  ......  Subscription required
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Heavy Mobile Equipment:

Mine Management:

Job TitleNamePhoneEmailProfileRef. Date
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Jan 10, 2023
....................... Subscription required ....................... Subscription required Subscription required Jan 10, 2023
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Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
Management Discussion & Analysis 2022
Preliminary Economic Assessment 2015
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News:

NewsDate
Radisson intersects 10.65 g/t Gold over 4.40 m and 21.84 g/t Au over 2.00 m at 900 m vertical depth along Trend 2 January 24, 2023

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