MERN - Québec Mines - Exporation in the Cadillac mining camp







        ISSN en ligne :
        1499-383X





June 2004
 

Exploration in the Cadillac mining camp:
Five projects are a resounding success!

Pierre Doucet
Direction de Géologie Québec

The Cadillac-Larder Lake Break hosts deep-seated mineral potential. Five exploration projects located in the Cadillac mining camp provide ample proof of this. Significant gold ore zones have been delineated within the fault zone at Lapa, Pandora, LaRonde II, Westwood and the "J" zone at the Doyon mine. Furthermore, the Lapa deposit represents one of the most important mining discoveries to take place in Québec in recent years. Other projects such as those in the 36 East Zone at the former O’Brien mine and below the former Bousquet mine are also likely to yield promising mineral potential.

Lapa project

An exploration campaign launched in 2002 on the Lapa property, held by Agnico-Eagle Mines Ltd, delineated a deposit with an inferred mineral resource estimated last June at 4.0 million tonnes at a grade of 8.5 g/t Au (over one million ounces of gold). The ore zone, dubbed the Contact Zone, was traced to a depth of 1,200 metres. It remains open at depth and to the west. A second structure, the Contact South Zone, was discovered in late 2003. A few months later, Agnico-Eagle Mines Ltd. announced that a 3.2 million-dollar budget would be allocated to test the depth extensions of the Contact and Contact South zones, and to test the eastward extension of the favourable geological horizon.

Pandora property

In 2003, Queenston Mining Inc. confirmed the extension of the Contact Zone onto its Pandora property, located just west of the Lapa property. The mineralized zone was identified in three locations: the Lapa Contact, Keel Contact and Central Contact zones. On January 13, 2004, the company reported a new drill program, comprising at least eight holes, would be undertaken in order to test the depth extension of the Lapa Contact Zone.

LaRonde II mine

Agnico-Eagle Mines Ltd continues exploration at depth and to the west of Zone 20 North at the LaRonde mine. The latest results indicate the presence of a higher-grade gold core, and have also shown that Zone 20 North may become wider at depth, southward and westward. This project, dubbed LaRonde II, will be allocated a budget of $3.8M for exploration and feasibility studies.

Note that Agnico-Eagle Mines also intends to explore at depth underneath the 3-1 Zone at the Bousquet mine (shut down in the fall of 2002), acquired from Barrick Gold in 2003. The company is also targeting the extension of known ore zones on the Ellison property located further west. A budget of $2.3M is set aside for this work.

Westwood property

A very deep drillhole collared in November 2002 by Cambior inc. on the Westwood property, located 2 km east of the Doyon mine, intersected two mineralized zones. The first occurs along the broad extension of zones 1 and 2 of the Doyon mine, whereas the second consists of the Westwood horizon. In 2004, Cambior Inc. will drill another hole from the surface to test the depth extension of the zone, and will drive a 2.6-km-long exploration drift from the Doyon mine to reach the Westwood area.

The "J" Zone J at the Doyon mine

On March 6, 2003, Cambior Inc. released promising results from an exploration program launched in October 2002 on the “J” zone at the Doyon mine. This structure, located east of existing infrastructure at the Doyon mine, was traced to a depth of 1,000 metres and remains open at depth and eastward. Based on a preliminary evaluation, the “J” zone contains an inferred diluted resource of 356,000 tonnes at a grade of 7.5 g/t Au.

Other known showings

The Cadillac mining camp (PDF Format, 603 Kb) also contains the former Wood Cadillac, Central Cadillac, Kewagama, O’Brien and Thompson Cadillac (New Alger) mines. With the exception of the O’Brien mine, these consist of near-surface deposits from which only a few hundred thousand tonnes of ore were extracted. Very little exploration work has been carried out throughout this area at depths greater than 400 metres.

Radisson Mining Resources Inc. intends to test the depth potential on the O’Brien property. A drill program involving at least six holes was announced, to test the eastward and depth extension of the 36 East Zone. Other gold showings are known west of the Thompson Cadillac mine. Very little exploration has been carried out on these showings, and the gold potential at depth remains unknown.

Work by the MRNFP

Mapping by the MRNFP (Dubé and Moorhead, 2002; Lafrance et al., 2002, 2003 and 2004) has provided a better understanding of the geology in the Cadillac area (PDF Format, 603 Kb). Within this framework, Fallara et al. (2003) prepared a common-earth 3D model of the area surrounding the Doyon-Bousquet-LaRonde mines, in order to synthesize all available geological, lithogeochemical and drilling data and to promote the use of this new technology as an exploration tool. The longitudinal section (PDF Format, 88 Kb), which extends from the Mouska mine in the west eastward to the LaRonde mine, shows all drillholes completed in this area. Note that drillholes exceeding 500 metres depth are few and far between. This figure also shows the gradual eastward deepening of the lower boundary of known ore zones, shown in red.

Outlook

If the Contact Zone on the Pandora property extends over more than 4.5 km, as Queenston Mining Inc. seems to believe, the potential on this property is considerable. The same can be said for the eastward extension, over 1 km, of the favourable horizon on the Lapa property. Moreover, between the Doyon mine and the Westwood property, a very wide area at depth offers tremendous gold potential. Zones beneath the Ellison showing and under the Bousquet mine are currently attracting the attention of Agnico-Eagle Mines. Further south, with the exception of the O’Brien mine, a 19-plus-km segment of the Cadillac–Larder Lake Break is essentially untested at depth. This represents a considerable volume of rock. Exploration completed to date has identified several important gold zones at depth in the Cadillac mining camp, but a significant proportion of the bedrock located at more than 500 metres depth remains unexplored.

References

DUBÉ, B. – MOORHEAD, J., 2002 – Synthèse des résultats du camp minier de Doyon-Bousquet-LaRonde : problématique et objectifs, Ministère des Ressources naturelles, Québec, Programme et résumé des conférences, 23Séminaire d’information sur la recherche géologique, DV 2002-10, page 20.

FALLARA, F. – LAFRANCE, B. – CHENG, Z.C. – BOUDRIAS, G. – CÔTÉ, J. – BÉDARD, N. – LEI, Y. – DUBÉ, B. – GALLEY, A.G., 2003. Modèle 3D géo-intégré de la Formation de Bousquet, Zone volcanique sud de la Sous-province de l’Abitibi, Québec, Ministère des Ressources naturelles, de la Faune et des Parcs, Québec, Résumés des conférences et des photoprésentations, Québec Exploration 2003, DV 2003-09, page 24.

LAFRANCE, B. – DAVIS, D.W. – MOORHEAD, J., 2002 – Contexte stratigraphique et volcanologique du camp minier de Doyon-Bousquet-LaRonde, Ministère des Ressources naturelles, Québec, Programme et résumé des conférences, 23Séminaire d’information sur la recherche géologique, DV 2002-10, page 21.

LAFRANCE, B. – MOORHEAD, J. – DAVIS, D.W., 2003 – Cadre géologique du camp minier de Doyon-Bousquet-LaRonde, Ministère des Ressources naturelles, Québec, ET 2002-07, 43 pages.

LAFRANCE, B. – DUBÉ, B. – GALLEY, A.G. – MERCIER-LANGEVIN, P. – CÔTÉ, J. – BÉDARD, N. – LEI, Y. – HANNINGTON, M.D. – DAVIS, D.W. – MOORHEAD, J. – PILOTE, P. – MUELLER, W.U., 2004 – Évolution volcanique et métallogénique de la Formation de Bousquet, Groupe de Blake River, Abitibi, Ministère des Ressources naturelles, de la Faune et des Parcs, Québec, Résumés des conférences et des photoprésentations, Québec Exploration 2003, DV 2003-09, page 23.

 














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