Orenada and Triangle Too
Location: SW Bourlamaque Township
Prospects: Gold, Copper
The Orenada property comprises the western third of Alexandria’s Cadillac Break property package, located approximately 4 km southeast of the town of Val d’Or, QC (Figure 1). The property straddles the Cadillac Break (or, Cadillac Tectonic Zone), a notable regional gold-bearing fault which hosts two near-surface vein-type gold deposits, Orenada Zone 2 and Orenada Zone 4, on the property (Figure 2). In the Fall of 2009, Alexandria completed a NI 43-101 compliant resource estimate on Orenada Zone 2 and 4 that identified a bulk-tonnage, near-surface deposit less than 250 meters depth with Measured and Indicated resources of 361,395 ounces of gold and an Inferred resource of 175,596 ounces of gold, at a 0.5 g/t cutoff (See Table Below).
GEOLOGY AND MINERALIZATION
The Cadillac Break is the dominant geological feature, separating a mostly volcanic terrain (Malartic Group) and related intrusive rocks on the north from a sedimentary terrain (Pontiac Group) on the south. Granitic stocks and sills have intruded into the volcanic rocks, the largest being the East Sullivan monzonite stock, and a smaller, but notable, diorite sill adjacent to the Orenada Zone 4 deposit.
Gold mineralization at Zones 4 and 2 is principally hosted in deformed metasedimentary schists and associated with deformed quartz-arsenopyrite-carbonate-tourmaline-veinlets. The Company has recently identified a suite of stacked, high-grade veins (Figure 3), within the bulk tonnage deposit, and in the process of evaluating the distribution and concentration of these veins in order to better determine their value to the size and grade of the deposit. The south dipping, high-grade gold veins, together with their gold-bearing alteration envelopes surrounding the veins, have so far been identified to a vertical depth of about 300 meters. Collectively, they are anticipated to have an important effect on the grade and size of the resources at Zone 4 and Zone 2.
The geology underlying the Orenada group of claims is consistent with a porphyry gold-copper system, and numerous prospects, past mines, and drill holes host styles of gold and copper mineralization consistent with this model. Of importance to this model is the East Sullivan monzonite intrusion, which notably hosts broad, low grade, stockwork-like copper mineralization within the intrusion, and gold and gold-copper mineralization around its flanks.
Notable prospects which occur on the property are: Mid-Canada (gold-copper), Orenada Zone 1 (gold-copper-silver), Zone 5 (gold-copper), Triangle Too (gold), D’Aragon (copper), Ducros 1 and Ducros 2 (copper) and Hogg (gold-copper) (Figure 4).
HISTORICAL EXPLORATIONSet featured image
1930 – 2000
Orenada has been intermittently explored since the early 1930’s, however, major exploration efforts did not begin until the early 1970’s. Between 1976 and 1984, Brominco completed 9,500 m of exploration drilling and outlined a resource of 357,295 tonnes with an average grade 2.86 g/t Au. Brominco continued development on the property with a small bulk tonnage sample that produced 865 ounces of gold (20,418 tonnes grading 1.67 g/t Au) at Orenada Zone 4.
Shortly after Brominco’s amalgamation with Aur Resources in 1985, a 276 metre shaft was sunk in the dioritic intrusive north of the CTZ. Over the course of the following two years an aggressive exploration program on the property saw the completion of 1,100 metres of exploration drifts; underground and surface drilling totaling 16,000 metres and 3,700 metres, respectively; and a resource estimate outlining 3.5Mt grading 1.65 g/t Au.
In the early 1990’s Aur Resources completed a second, larger, bulk sample that produced 4,000 ounces of gold (72,195 tonnes grading 1.72 g/t Au) via custom milling at the Company’s Lac Herbin mill facility, located 10km north of the Orenada property.
Alexandria Exploration 2007 – 2009
Alexandria began a multi-rig exploration programme in the Spring of 2007 that concluded in July 2008 with 52-holes of exploration drilling totaling 21,744 metres. This drill programme expanded the zone of mineralization from 200m wide and 100m deep to over 800m along strike 450m deep.
In early 2009, Geologica Groupe-Counsel was commissioned by Alexandria to complete a NI 43-101 resource estimate on Oreanda Zone 2 and Zone 4. The report, released in August 2009, outlines a near surface gold deposit with a Measured and Indicated resource of 361,395 ounces of Au (0.5 g/t Au cutoff) and an Inferred resource of 175,596 ounces Au (see Table below).