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Canada
O’Brien Project

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 Location:
1.3 km NW from Cadillac, Quebec, Canada

  Project Contacts:
P.O. Box 307
1750 ch. de la Baie-Verte
Rouyn-Noranda
Quebec, Canada
J9X 5C3
Phone  ...  Subscription required
Fax819 277-6578
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  • Overview
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  • Mining
  • Processing
  • Production
  • Reserves
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  • Filings & News

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Overview

StagePreliminary Economic Assessment
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Sub-level stoping
  • Avoca
Processing
  • Gravity separation
  • Agitated tank (VAT) leaching
  • Carbon in pulp (CIP)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life6 years (as of Jan 1, 2015)
Latest NewsRadisson intersects 24.22 g/t Au over 3.00 m and 19.63 g/t Au over 3.40 m, up to 280 m...     February 4, 2021


Owners

 
CompanyInterestOwnership
Radisson Mining Resources Inc. 100 % Direct

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°.

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).

Greenstone-hosted quartz-carbonate vein deposits occur as quartz and quartzcarbonate veins, with valuable amounts of gold and silver, in faults and shear zones located within deformed terranes of ancient to recent greenstone belts commonly metamorphosed at greenschist facies (Dubé and Gosselin, 2007). Greenstone-hosted quartz-carbonate vein deposits are a subtype of lode gold deposits (Poulsen et al., 2000). They are also known as mesothermal, orogenic. They consist of simple to complex networks of gold-bearing, laminated quartz-carbonate fault-fill veins in moderately to steeply dipping, compressional brittle-ductile shear zones and faults, with locally associated extensional veins and hydrothermal breccias. They can coexist regionally with iron formation-hosted vein and disseminated deposits, as well as with turbidite-hosted quartz-carbonate vein deposits. They are typically distributed along reverse-oblique crustal-scale major fault zones, commonly marking the convergent margins between major lithological boundaries such as volcanoplutonic and sedimentary domains. These major structures are characterized by different increments of strain, and consequently several generations of steeply dipping foliations and folds resulting in a fairly complex geological collisional setting.

Typically, the alteration haloes are zoned and characterized, at greenschist facies, by iron-carbonatization and sericitization with sulphidation of the immediate vein selvages (mainly pyrite, less commonly arsenopyrite).

The main gangue minerals are quartz and carbonate with variable amounts of white micas, chlorite, scheelite and tourmaline. The sulphide minerals typically constitute less than 10% of the ore. The main ore minerals are native gold with pyrite, pyrrhotite and chalcopyrite without significant vertical zoning. (Dubé and Gosselin, 2007).


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.

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 achieved using a longitudinal retreating process. All the broken mineralized material is extracted before another slice is blasted to ensure maximum recovery of the mineralized material should any unplanned caving occur. Once the stope is completely mined out, waste rock is dumped in the empty stope as uncemented rock fill. To be able to blast the second stope of the same level, a void must first be created by pulling out some of the backfill of the first fully-backfilled stope. The second stope is then blasted, mucked and backfilled. The process is repeated until all sublevels are mined out. This mining method can also be referred to as longitudinal long-hole retreat mining method. Some parts of the mucking and backfilling steps are performed with remotely operated LHDs for safety reasons.

In some areas, the captive long-hole method was an economically better choice than the modified Avoca mining method. Long-hole stopes will be mined from 3-metre-high sublevels at ±15-metre vertical intervals. It is assumed that stopes will be backfilled. Pillars will be left in place between panels and mining horizons. It was assumed that pillars will have a minimum width of metres or 1.5 times the width of the stopes.

The method consists in drilling and blasting 63.5-mm-diameter holes in a pattern parallel to the walls. Holes are drilled upward or downward depending on the context.

The development sequence consists in accessing the mineralized zone and excavating a level cut in the mineralized zone. The mining sequence will require the excavation of a raise opening, which is either developed as a conventional raise or as a drop raise when a top access is available. Once development is completed, the mineralized zone is surveyed with precision for the preparation of the drilling and blasting pattern.


Crushing and Grinding


Processing

  • Gravity separation
  • Agitated tank (VAT) leaching
  • Carbon in pulp (CIP)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Source: Subscription required

Summary:

The recent metallurgical testwork has demonstrated the amenability of O’Brien mineralized material to the gravity, leaching and flotation processes.

The O’Brien Project is planned for a five-year period at a production rate of 500 tpd. Five gold concentrators located within a 75-km radius were then identified as being able to potentially process the O’Brien material: the Kiena Mill, the Sigma-Lamaque Complex, the Camflo Mill, the Westwood Mill and the Aurbel Mill.

The Westwood and Aurbel mills have shown interest. This PEA is based on the use of the Westwood mill.

The ore is first dumped on a heavy-duty grizzly at the mine site. The oversize rock (> 18 inches) will be crushed by a contractor. The ore will be loaded and trucked to the Westwood mill.

The plant will process ore at a rate of 2,400 tonnes per day for an entire month. During this period, the circuit will be dedicated to custom milling. Ore extracted at the Westwood mine will be sto ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Gold Recovery Rate, %  ......  Subscription required
Gold Head Grade, g/t 6.46
Subscription required - Subscription is required.

Projected Production:

CommodityUnitsLOM
Gold oz 135,308

Operational Metrics:

Metrics
Daily mining capacity 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 of ore *
Daily processing rate 2,400 t of ore *
* According to 2015 study.

Reserves at November 29, 2015:

CategoryTonnage CommodityGradeContained Metal
Indicated 570,800 t Gold 6.53 g/t 119,819 oz
Inferred 918,300 t Gold 6.38 g/t 188,466 oz

Commodity Production Costs:

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

Operating Costs:

Units2015
UG mining costs ($/t mined) CAD 42.5 *
Processing costs ($/t milled) CAD  ......  Subscription required
Total operating costs ($/t milled) CAD  ......  Subscription required
* According to 2015 study.
Subscription required - Subscription is required.

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
Subscription required - Subscription is required.

Heavy Mobile Equipment:

Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Preliminary Economic Assessment 2015
Subscription required - Subscription is required.

News:

NewsDate
Radisson intersects 24.22 g/t Au over 3.00 m and 19.63 g/t Au over 3.40 m, up to 280 m... February 4, 2021
Radisson intersects 14.90 g/t over 8.00 m, 41.04 g/t Au over 2.30 m and 5.73 g/t over 9.20 m... January 20, 2021
Radisson intersects 110.97 g/t Au over 2.50 m highlighting lateral resource expansion potential on the first trend at the O’Brien project December 1, 2020
Radisson Announces Closing of Oversubscribed $13 Million Private Placement November 12, 2020
Radisson announces a $6M Private Placement October 19, 2020
Radisson Announces Upsize of its previously announced Private Placement to $11 Million October 19, 2020
Radisson Mining Resources Inc.: Drilling at O'Brien intersects 6.89 g/t Au over 21.10 m including 11.32 g/t over 11.80 m... October 14, 2020
Radisson Mining Resources Inc.: Step-out drilling at O’Brien intersects 92.89 g/t Au over 2.60 m, 47.10 g/t Au over 2.50 m and 45.33 g/t Au over 2.20 m... October 7, 2020
Radisson Mining Resources Inc.: Step-out drilling intersects 45.86 g/t Au over 2.10 m, 21.29 g/t over 2.00 m and 17.90 g/t over 2.15 m... September 2, 2020
Radisson Mining Resources Inc.: Drilling at O’Brien delivers high-grade gold intercepts highlighting resource growth potential near surface and at depth July 20, 2020
Radisson Announces Upsize of its previously announced Private Placement to $2.4 Million June 15, 2020
Radisson announces investment by the Marshall Precious Metals Fund managed by David Garofalo June 9, 2020
Drilling at O’Brien highlights opportunities for high-grade resource growth east and west of the 36E and F Zones June 1, 2020
Radisson Mining: Drilling at O’Brien continues to deliver high-grade gold intercepts highlighting resource expansion potential at depth and within the current resource area February 6, 2020
Radisson continues to intersect high-grade gold at depth and within the current resource area at O’Brien January 17, 2020
Radisson Announces closing of a $5 Million Private Placement, including increased participation from M. Rob McEwen December 19, 2019
Radisson Announces Upsize of its previously announced Marketed Private Placement to $5 Million December 4, 2019
Radisson Announces $4 Million Marketed Private Placement December 3, 2019
Radisson intersects 66.71 g/t gold over 4.70 m, 300 m below deepest level of current resources at O’Brien October 29, 2019
Radisson files NI 43-101 Technical report for the O’Brien Resource Estimate on SEDAR August 29, 2019
Radisson announces closing of $6M bought deal private placement including investment from Rob McEwen August 23, 2019
Radisson Announces Upsize of its Previously Announced Bought Deal Private Placement to $6 Million August 7, 2019
Radisson Announces $4 Million Bought Deal Private Placement July 24, 2019
Radisson’s New Mineral Resource Estimate and Geological model deliver higher grades at O’Brien; 9.48 g/t Au for Indicated resources and 7.31 g/t Au for Inferred resources July 15, 2019
Radisson announces 5.42 g/t Gold over 15.30 m and 22.96 g/t Gold over 2.40 m, 40 metres west of High-Grade Intercepts recently published in 36E zone; O’Brien project, Cadillac Break January 21, 2019

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