The Mir 7 occurrence is located west of Terrahina Creek, about 49 kilometres east of the community of Atlin.

The area is underlain by alaskitic quartz monzonite of the Late Cretaceous Surprise Lake batholith (Surprise Lake Plutonic Suite). The rocks are commonly interlayered with aplitic and pegmatitic phases. The 'Trout Lake graben' trends northerly across the area.

The graben area contains several radioactive springs and pools with high radon values. A sample of the Delta pool analyzed 82,856 picocuries per litre radon gas. A nearby soil sample assayed 0.11 per cent uranium, 0.62 per cent copper, 0.54 per cent lead, and 15.8 grams per tonne silver (Assessment Report 6776).

In 1978, a drillhole in the area intersected a 2-metre radioactive zone with sericite, chlorite, pyrite and chalcopyrite. A 60-centimetre sample assayed 0.009 per cent uranium oxide and 1-metre sample assayed 0.005 per cent uranium, 4.8 grams per tonne silver, and 0.15 per cent copper (Assessment Report 6905). Minor galena and sphalerite were also evident.

In 1977, an exploration program was conducted on parts of the Mir 1-7 claims by Union Oil Company of Canada Ltd. Grid controlled radiometric and geochemical surveys and prospecting work was completed in addition to follow-up geochemistry and reconnaissance scintillometry along the western Trout Lake graben margin. Work on the Mir property was done at intervals, being part of a larger program involving the Surprise Lake batholith and surrounding area. In 1978, three BQ diamond-drill holes totalling 449 metres were drilled on the Mir 3 (104N 113) and Mir 7 claims on behalf of Union Oil Company of Canada Ltd.

In 2006, Aldershot Resources Ltd. conducted a spectral analysis program on their Atlin East property which covers the CX (104N 114), Mir 3 (104N 113), Mir 7 and CX 2 (104N 111) occurrences. The program involved acquisition of satellite spectral data available from NASA, reconfiguring the data into a workable format, geo-referencing to TRIM map bases and extensive and rigorous classification of the data in search of indicators that might lead to the discovery of uranium mineralization.