Doré Ramp - Doré Copper Mining Corp

Doré Ramp

The Doré Ramp gold-copper deposit is located approximately 2.5 km by road of the Copper Rand mill.

In the summer of 2022, Doré Copper completed one diamond drill hole (LDR-22-01) and intersected two veins with one grading 4.37% Cu, 0.87 g/t Au and 13.0 g/t Ag over 2.4 meters, including 17.6% Cu, 1.76 g/t Au and 43.90 g/t Ag over 0.5 meter, at a vertical depth of 880 meters, which is approximately 500 meters deeper than the historical estimate. This hole indicates the potential to extend the currently known Doré Ramp mineralized system at depth. In Q4 2022, Doré Copper plans to complete four wedge cuts from hole LDR-22-01 to test for vein extensions and new veins. 

The immediate vicinity of the Copper Rand mill is showing strong potential for the discovery of new copper and gold mineralization. The Doré Ramp deposit (previously called Lac Doré Ramp) is within the Chibougamau Central mining camp and as many other deposits and mineral occurrences it is within a wide (from 100 to 400 meters) shear zone perpendicular to the Lac Doré fault. In the Chibougamau Central camp, the copper and gold-rich mineralized zones are in contact with acidic to intermediate dykes interpreted as coming from the Chibougamau Pluton. The Doré Ramp deposit starts at 80 meters below surface and has been tested over a strike length of approximately 500 metres. It consists of a series of subparallel pinch and swell veins, varying in thickness from 0.3 to 7.7 meters, that extend from 150 to 300 meters along strike. A number of mineralized lenses are displaced by northeast faults at 15 to 30 metres intervals. 

The Doré Ramp deposit was drilled in a few different phases from 1984 to 1992. A total of 47 drill holes from surface are reported during that period. A double ramp of approximately 1 kilometer was excavated in 1991-92 to a vertical depth of 160 meters, followed by an underground drilling campaign of 46 holes totaling 10,200 meters testing the deposit mainly to a depth of 240 meters (only five holes tested the deposit between 300 and 600 meters). At the end of 1992, Westminer Canada reported a historical estimate of 209,120 tonnes at 1.23% Cu and 5.4 g/t Au, from a depth of 115 meters (surface pillar limit) to 350 meters (Source: Westminer Canada Limited, Project Lac Doré, November 1992)1.No subsequent exploration programs were carried out on the Doré Ramp deposit. The deposit remains open at depths below 400 meters and along strike towards the Lac Doré fault.

The Doré Ramp deposit has several geological and mineralization characteristics similar to the past producing Copper Rand and Cedar Bay mines. The Copper Rand mine is the largest past producing mine in the Central Chibougamau mining camp having produced 1.5 million ounces of gold and 0.5 billion pounds of copper from 1959 to 2008 (16.4 million tonnes at an average grade of 1.8% Cu and 2.8 g/t Au)2. From surface, the mineralization at Copper Rand and Doré Ramp begins at 450 meters from the Doré Lake fault and plunges to the west. At Copper Rand, at depths below 650 meters, the mineralization extends next to the contact with the Doré Lake fault. This conceptual target has never been tested at the Doré Ramp deposit. With the first deeper hole (LDR-22-01) having intersected copper-gold mineralization, the next drilling phase will indicate if the mineralization system extends up dip along strike.

Doré Ramp North Zone

The Doré Ramp North Zone is located 450 meters northeast of the Doré Ramp deposit and is defined by a shear corridor parallel to the Doré Ramp shear. Information collected from 11 historical drill holes targeting the Doré Ramp North show similar mineralization to the Doré Ramp. The best intersections reported were 2.13% Cu and 1.25 g/t Au over 2.3 metres (hole S4-91-6) and 1.43% Cu and 1.68 g/t Au over 2.75 metres (hole S4-91-9) (Source: Westminer Canada Limited, drill logs March 1991). Doré Copper intends to follow up on this target after completing the drilling program at the Doré Ramp and continue its compilation work on the area around the large Copper Rand property in the Central Chibougamau Camp.

  1. This estimate is considered to be historical in nature and should not be relied upon. A Qualified Person has not completed sufficient work to classify the historical estimate as a current mineral resource or mineral reserve. The Company is not treating the historical estimate as current mineral resources or mineral reserves). 
  2. Sources for historic production figures: Economic Geology, v. 107, pp. 963–989 – Structural and Stratigraphic Controls on Magmatic, Volcanogenic, and Shear Zone-Hosted Mineralization in the Chapais-Chibougamau Mining Camp, Northeastern Abitibi, Canada by François Leclerc et al. (Lac Dore/Chibougamau mining camp) and NI 43-101 Technical Report on the Joe Mann Property dated January 11, 2016 by Geologica Groupe-Conseil Inc. for Jessie Ressources Inc. (Joe Mann mine).


Doré Ramp – Location and Geology
Copper Rand and Doré Ramp – Long Section similarities