Скачать или смотреть Onjo Copper Gold Project - Technical Presentation

Orogen Royalty's Onjo copper-gold project is located 70 kilometres north of Fort St James in British Columbia and 10 kilometres west of Centerra’s Mount Milligan mine, which has proven and probable reserves of 959 million pounds of copper and 2.4 million ounces of gold.

The 97 square km Onjo property is located in the Quesnellia arc, host to several significant alkalic copper-gold porphyry deposits including Imperial metals Mount Polley mine, Newgold’s New Afton mine and Copper Mountain.

Onjo occurs on a magnetic trend that hosts the Mount Milligan mine and chuchi deposit and which has seen recent exploration success at Kwanika (now owned by Northwest Copper) and a rush of staking in 2021 by major companies including South 32 and Centerra.

The Onjo claims are predominantly underlain by the Witch Lake Diorite which intruded andesitic volcaniclastics of the Quesnel terrane. The geology and geochemistry of the property is largely covered by glaciofluvial and lacustrine sediments with rare outcrops of an extensive copper-gold skarn, a focus of shallow diamond drilling in the early 1990’s. Historic drilling also identified multiple occurrences of thin monzonite dykes associated with minor potassic alteration and copper anomalism, an analogous host rock to the Mount Milligan mine mineralization.
Relogging of the historic drill core by Orogen geologists identified multiple indicators of the top of an alkalic porphyry system.

Orogen’s technical team believes vectoring into copper-gold mineralization from the tops of alkalic porphyry copper-gold systems represents a significant exploration opportunity in British Columbia where there has been no significant economic porphyry discovery when the potassic core of the system has not been at surface level.

Major porphyry copper-gold systems including Newcrest’s Cadia-Ridgeway mines in New South Wales, Australia and Vale S.A.’s Onto copper-gold deposit in Indonesia, which were discovered where mineralizing intrusions occur at depth, provide excellent analogues to generate porphyry targets such as the Onjo property.

Relogging of the historic drill core by Orogen identified multiple indicators of the top of an alkalic porphyry system including garnet skarns, copper-gold skarns, late barren lithocap, magnetite and hematite replacement of pyroxenes and copper bearing leakage structures. These features are highlighted over a 500 by 500 metre region prospective for a buried alkalic porphyry copper-gold system.

Additional exploration plans include airborne geophysical survey across the principal target area to delineate prospective monzonite plugs within the larger diorite body for drill target generation.