[ONGLET]Location and mining titles[/ONGLET]
The O’Brien project is located in the Abitibi region in northwestern Québec, on provincial highway 117, about halfway between the towns of Rouyn-Noranda and Val-d’Or. This project also contains the contiguous Kewagama property of Radisson located immediately to the east. Gravel roads provide easy access to the properties.
Radisson Mining Resources Inc. has a 100% interest in the 617.26-hectare property, which is divided into 33 mining claims. The property is subject to a royalty of $1 million payable to Nyrstar (formerly Breakwater Resources Ltd.) at the beginning of commercial production. A core library and offices are located on the property.
The O’Brien project is located in the central part of Cadillac Township, Abitibi, in the heart of one of the most productive gold mining camps in Canada, the Cadillac Mining Camp, which boasts over 45 million ounces of gold (produced and in reserves and resources).
The project straddle the Cadillac-Larder Lake Break (or Cadillac Break), a regional structure that not only hosts past and present gold producers, including the Lapa, Kerr Addison and Macassa mines, but also several highly prospective zones. Much of the mining camp’s gold mineralization is associated with the Cadillac Break and its subsidiary structures.
In the Cadillac area, about 7 km east of the O’Brien project, straddling the same geological formations and also along the regional Cadillac Break, is the Lapa Gold Mine, a significant producer owned by Agnico-Eagle Mines Limited. Production at the Lapa mine began in 2009 and is expected to continue until 2016. Its proven and probable reserves total about 400,000 ounces of gold (2.1 million tonnes grading 6.0 grams of gold per tonne). This mine’s gold grades are almost twice as high as Agnico-Eagle’s average. (Reference: Agnico-Eagle website: Operations/Our Operations/Lapa, on August 12, 2013).
In addition, the O’Brien project is located approximately 3.7 km southeast of the LaRonde gold mine (owned by Agnico-Eagle), which has one of the largest gold reserves of any operating mine in Canada. LaRonde has produced almost 4.3 million ounces of gold since it opened in 1988. The mine still has 4.2 million ounces of gold in proven and probable reserves (29 million tonnes grading 4.5 g/t) (Reference: Agnico-Eagle website: Operations/Our Operations/LaRonde, on August 12, 2013).
Both the O’Brien and Kewagama properties are underlain in the south and north by sedimentary rocks: the Pontiac Group in the south and the Cadillac Group in the north. The centre is characterized by a thin strip of volcanosedimentary rocks with porphyry intrusions known as the Piché Group. All the mineralized structures of the old O’Brien and Kewagama mines lie within the Piché Group. Overall, the formations are oriented east-west with a steep dip to the south. Across the property, the Cadillac Break zone is subparallel to the Piché Group/Cadillac Group contact.
The gold mineralization of the project is associated with deformation zones within the rocks of the Piché Group. There are three main styles: veins and veinlets of quartz often with free gold, gold-bearing-sulphide-enrichedalteration halos in the walls, and tabular zones with biotite or sericite and gold-bearing sulphides.
Gold intersections, sometimes with free gold, associated with narrow quartz-arsenopyrite veins (pyrite) were also cut by historic drilling and by Radisson drilling in Pontiac Group sediments in the south and Cadillac Group sediments in the north.
Old O’Brien gold mine and 36E area
In 1924, the claims were staked by two prospectors for the M.J. O’Brien Company Ltd. and vein No. 1 was discovered by prospecting. The O’Brien mine was therefore discovered in 1924 during the first period of exploration in the region. In 1925, the No. 1 exploration shaft was sunk to a depth of 110 feet (33.5 metres) and a period of intensive exploration began. The main production shaft (shaft No. 2) was put into operation in 1930 and was deepened to 2,125 feet in 1934. Construction of an internal shaft was initiated in 1941 and completed in 1949. It extended to a vertical depth of 3,450 feet below surface. In 1933, the O’Brien mine went into production and was operated until 1956. From 1925 to 1956, the mine produced approximately 1,310,356 short tons of ore at an average grade of 0.448 ounces of gold per ton (RPA, May 2007). The mine was closed and the surface infrastructure was dismantled in 1957
In the early 1970s, the property was acquired by A.N. Ferris & Associés, which carried out a major drilling program and subsequently began to rebuild surface infrastructure. In 1977, Consolidated Goldfields Mining acquired a 51% interest in the project and Darius Gold Mine Inc. was created. The upper levels of the mine were then refurbished and a new mill, with a capacity of 200 short tons per day, was built in 1977–1978. Darius processed a total of about 141,500 short tons of ore at a grade of 0.12 oz/st before it closed in 1981 (RPA, May 2007).
Sulpetro Minerals (which became Novamin, then Breakwater and then Nyrstar) bought the property in December 1981, and renamed it the O’Brien Division. The initial interest was to acquire the mill to process ore from a contiguous property: Kewagama. In 1985, the O’Brien mine was flooded once again and geophysical surveys were carried out. In 1986–1987 a program of exploration drilling tested extensions east and west of the property and led to the discovery of 36E area located about 2,000 feet (610 metres) east of the main shaft of the old O’Brien Mine. In 1988, additional holes were drilled on 36E area.
Breakwater acquired Novamin in 1989 and drilled additional holes in this area, and then produced a first estimate of mineral resources. However, these resources were estimated before National Instrument 43-101 standards of disclosure came into force.
In 1994, Radisson obtained an option to acquire 50% of the O’Brien property. In 1999, the Company acquired 100% of the O’Brien property.
Radisson's exploration efforts have focused on 36E area of the O’Brien property. They have allowed this area to be interpreted as a complex of veins and veinlets similar in nature and characteristics to those extracted from the old O’Brien Mine, including high-grade zones.
During the 2004 drilling program, 36E area was explored at depth. Hole OB04-01A returned numerous anomalous gold values. The most interesting intersection yielded a grade of 0.40 oz/st over a core length of 1.0 foot (from 4,663.0 feet to 4,664.0 feet), corresponding to a vertical depth of approximately 4,200 feet (1,280 m). The drilling also intersected wide mineralized alteration zones.
Potential depth extension - 36E AREA
*True width is estimated at 60-70% of core length.
**NQ core, sawn in half, was analyzed by Laboratoire Expert of Rouyn-Noranda in 2004 by fire assay with atomic absorption finish, or by metallic sieve method when visible gold was present.
The alteration and mineralization encountered in this hole are typical of the old mine and of 36E area. These results show the potential of extending 36E area well beyond the existing infrastructure (former exploration drift - 2,000-foot level). In addition, the high grade intersection cut by this hole compares favorably with the old O’Brien mine’s historical grades.
2007-2012 Drilling Programs- 36E AREA
In fall 2012, Radisson drilled 17 short vertical holes to estimate the average thickness of overburden and rock quality in the projected path of the Zone 36 East decline.
Cadillac Group and Pontiac Group – O’Brien property
Radisson’s drilling also cut several gold intersections, some with high grades and free gold, associated with narrow quartz-arsenopyrite-(pyrite) veins in Pontiac Group sediments in the south, and Cadillac Group sediments in the north.
North sector–Cadillac Group, O’Brien property -Main results 1997 drilling
*True width is estimated at 60-70% of core length.
All scientific and technical data discussed in this document has been prepared by or under the supervision of Yolande Bisson, Eng. MBA,consultant, who acts as a Qualified Person for the Company, as defined by NI 43-101.