The NGU occurrence is located approximately 85 kilometres northwest of Stewart British Columbia in the headwater region of Snippaker Creek, in an area known for a multitude of mineral occurrences and past producing mines termed the Bronson Corridor. Regionally, NGU is located approximately 18 kilometres southeast of the past producing Johnny Mountain mine (MINFILE 104B 107), and approximately 23 kilometres southeast of the past producing Snip mine (MINFILE 104B 250).
Regionally, the area is underlain by stratified rocks of the Upper Triassic Stuhini Group and Upper Triassic to Lower Jurassic Hazelton Group, which are intruded by Jurassic plutons and smaller bodies considered comagmatic with the Hazelton Group (Assessment Report 35943). Epiclastic and volcaniclastic rocks of the Stuhini group are unconformably overlain by siliciclastic, volcanic, and volcaniclastic rocks of the Hazelton Group. These strata are cut by diorite, quartz diorite, and monzodiorite plutons, plugs, and dikes of the Lehto suite (Paper 2015-1, pp. 41-58).
The controlling structural feature in area of the NGU and Pins occurrences is the Sky Fault System, a system of significant normal and reverse structures that extends from Pins Ridge in the southeast, through Sericite Ridge to Khyber Pass to the northwest. Likely forming close to the boundary of a rift-type basin, the Sky Fault System enhanced the circulation of hydrothermal fluids generated during Lehto suite plutonism which resulted in the mineralized deposits of the Bronson Corridor (Paper 2015-1, pp. 41-58).
Following up prospecting and sampling from 2014, Colorado Resources Ltd. returned to the Pins area in 2015 and continued prospecting and sampling of the Pins Bowl area. This led to the discovery of the NGU occurrence characterized by intrusion relation gold and copper porphyry mineralization. Mineralized monzonitic dykes at NGU occur in the immediate footwall of the Sky Fault System. Stockwork quartz-magnetite-chalcopyrite veins are hosted in a melanophase, dark brown matrix, fine-grained monzonite. Several intrusive phases have been identified at NGU, and the melanophase monzonite may grade into a monzonite unit with megacrystic orthoclase. In the Pins Bowl area these intrusions have a defined strike length of 1500 metres (Assessment Report 35943).
Prospecting and sampling in 2015 that lead to the discovery of the NGU occurrence reported a rock grab sample of monzonite with a 10 to 15 centimetre quartz vein with chalcopyrite. Assay results of this sample returned 1.13 grams per tonne gold and 2.44 per cent copper. Additionally, approximately 300 metres to the northwest, a 1 metre channel sample returned 0.28 gram per tonne gold and 0.93 per cent copper (Assessment Report 35943).
A ground magnetometer survey in 2015 of the Pins Bowl area indicated that gold and copper mineralization is associated with a 500 by 100 metre wide, southeast-trending magnetic high feature (Assessment Report 35943).
In 2018 Colorado drilled Hole # PNDDH18-140 In the NGU zone, the simple targeting of high gold anomalies in surface rock samples and adjacent trenching did produce anomalous copper in downhole core. The anomalous gold may be a surficial expression (the hole collared into monzonite intrusive) and passed directly into pyrite altered metasedimentary rocks and no further intrusive rocks were encountered (in the hole). However, this single drill hole represents only one intersection in a large prospective area. The area is in proximity to the Sky Kyber Fault, with over a kilometer of strike length of the fault adjacent, and a broad area of anomalous copper in soils/rocks to the east (Assessment Report 38707).
