The Eng 2 occurrence is located on a southern flowing tributary (Galena Creek) of Terrahina Creek, about 42 kilometres east of the community of Atlin.
The showing is located near the southern margin of the Surprise Lake batholith on the upper reaches of a south-flowing tributary (Galena Creek) of Terrahina Creek. The batholith covers about 1100 square kilometres east and northeast of Atlin and is dated at 70.6 plus or minus 3.8 million years or Late Cretaceous. It is composed primarily of medium grained, equigranular alaskite, which is essentially a leucocratic granite with microcline and orthoclase, with subordinate quartz and may or may not contain plagioclase and mafics. There are some coarse grained, quartz-feldspar porphyritic varieties. The contacts between the various textural varieties are commonly gradational. Massive aplitic dikes crosscut the batholith. There are also some very coarse grained pegmatitic zones within the alaskite with large quartz and feldspar crystals and books of biotite. The width of these zones varies considerably, but the contacts are almost always sharp.
A lead-zinc geochemical anomaly about 600 metres long, open to the east and west, was outlined in 1979 on "Galena Creek" (Assessment Report 8413). The Eng 2 showing consists of some surficial galena mineralization that was observed but did not resemble highly altered alaskite boulders found in the creek containing disseminations and veins of galena and sphalerite. One sample contained 15 per cent lead, 9.5 per cent zinc and 56.2 grams per tonne silver (Assessment Report 7556).
In 1980, drilling on this zone intersected 1.5 metres of chloritized alaskite containing up to 5 per cent galena and sphalerite (Assessment Report 8638).
In 1977-78, the Eng and Cy claims were staked on behalf of Noranda Mines Limited to cover a radioactive area discovered by a regional helicopter-borne radiometric survey in 1977. Geochemical sampling, radon detection in water and soil, and radiometric surveys were carried out to cover most of the Cy claims in 1977. In 1978, detailed geochemical and geophysical surveys (magnetometer, Radem, VLF, induced polarization, radiometric) were completed, mainly on the CY-3, CY-4 and CY-6 claims. During the first part of the 1979 program (June and July) work was concentrated on the CY-3, CY-6 to CY-9, and ENG-1 to ENG-3 claims. This included geological mapping, prospecting, magnetometer, radiometric and radon in soil surveys. No primary uranium mineralization was discovered, however, following encouraging results for other metals obtained during the June-July 1979 period of work, exploration was renewed in August and September. A camp was established at the mouth of Caribou Creek and geochemistry and trenching was done. During the summer of 1980, an airborne electromagnetic and magnetometer survey was completed in addition to ground electromagnetic and magnetic surveys, geochemical surveys including soil and stream sediment sampling, limited trenching, and diamond drilling 16 AQ holes for a total of 1926 metres.
