Great Western has 8 distinct claim groups in Nevada targeting both precious metals and base metals. Please explore each claim group and use the table below to see the different stages of exploration and subsequent evolution. Feel free to contact us with any questions you might have and we will be happy to help.

Snapshot

Eastside Mine (EM)

The historic Eastside Mine (“Eastside”) produced high-grade oxide copper ores from shallow underground workings during World War One, and the area has been known as a porphyry target since the 1970s.

The most recent development at Eastside is the signature of a pooling agreement with neighbouring claim holders Bronco Creek Exploration, Inc. Bronco Creek is a division of EMX Royalty Corporation which has a large and active portfolio of mining operations and investments, in north America and around the world. This arrangement provides Great Western with a shared interest in a far larger surrounding claim block, with widespread porphyry potential.

Prior to this, at Eastside, Great Western has undertaken:

  • A mapping and soil sampling programme which identified corridors of prospective mineralisation and alteration associated with fault zones on satellite imagery
  • An IP (induced polarisation) geophysical survey, which has identified several significant chargeability zones, correlating with surface showings of alteration of target type and copper and molybdenum anomalism in soils
  • A field review with an independent porphyry specialist who highlighted the strength of the alteration in the area

Key Facts

  • High grade oxide copper ores were previously mined at Eastside Mine
  • Likelihood of copper-porphyry style orebodies at depth
  • IP results have identified strong chargeability targets associated with surface veining, alteration and copper shows
  • Independent expert advice has highlighted strength of target

Images

Exploration

A mapping and soil sampling programme successfully identified anomalous zones. Two extensive northeast trending corridors host Cu enriched soil anomalies and Cu quartz vein bearing fault breccias at surface. The intervening area is a graben with post-mineralisation volcanic cover – the porphyry system is likely to also occur on the down-dropped block. Historical works as well as work by Great Western indicate the likelihood of copper-porphyry style orebodies at depth.

An IP survey has been completed. Survey profiles were orientated in an east-west direction and designed to test down to 300 m depth. Two of the three profiles successfully identified targets of interest, leading to the identification of two graben structures bounding a central horst block. The faults that control these structures have both high chargeability and high resistivity features, interpreted as representing potential mineralised zones (chargeable) adjacent to silicified wall rocks (resistive). The structures spatially correspond to several surface features indicative of mineralisation, including copper showings, silicified stockwork zones and copper soil geochemistry halos.

A visit by porphyry expert Dr Lawrence Carter occurred in 2024. Dr Carter highlighted the strength of alteration present at surface, considering it amongst the strongest in Great Western’s portfolio.

Geology

The historic Eastside Mine (“Eastside”) produced high grade oxide copper ores from shallow underground workings during World War One. These historical mineral workings, which trend northeast indicate a substantial mineralisation event.

Conoco investigated Eastside as a copper porphyry prospect in the early 1970s, identifying mineralisation consisting of substantial copper (Cu) and molybdenum (Mo) values, lying on trend to the northeast from the existing workings.

The trend of the workings also parallels regional scale normal faulting.

Photo imagery indicates the presence of crosscutting WNW-ESE strike slip faults, where the junctions between the opposing fault trends provide prospective traps for mineralisation.

Great Western has identified intense quartz-sericite-pyrite “QSP” alteration on its claims. This alteration includes intense zones of stockwork and sheeted quartz veins and is indicative of the high levels of a porphyry copper system. Local outcrops of minor porphyry dykes occur in association with these alteration zones. It is likely that any porphyry system would extend beneath post mineral cover.

Location