The Old Skyline group, comprising the Skyline, Perhaps and Morning Star claims, is situated at an elevation of 1500 metres, 9.6 kilometres from Ainsworth.

The area is underlain by rocks of the Upper Mississippian to Lower Permian Milford Group. The showings are in limestone and in dark-grey to black phyllites and associated argillite. The eastern margin of the Nelson batholith is within a few hundred metres. The ore consists of porous siliceous rock carrying a dark mineral (argentite?), native silver, galena, and iron and copper pyrites. Values in gold and zinc are also reported from assays.

The mine was worked in the early 1980s and the ore shipped partly to the Pilot Bay smelter and partly to American smelters. The mine is reported to have been closed down in 1896. The workings at that time included an incline 26.5 metres deep, and a shaft further to the west sunk to a depth of 61 metres with a drift on the bottom level 37 metres in length.

In 1917, A.W. McCune drove a crosscut tunnel to tap the vein about 137 metres below the surface at the old workings. The vein was encountered approximately 366 metres from the portal. The vein was then drifted on for some distance, but little sulphide mineralization was encountered. Work was abandoned in 1918 and all equipment removed. In the period 1919-1921 the property was worked under lease and bond and a small amount of ore mined, mostly from surface exposures and from the upper part of the old workings. During this period also a raise was begun from the adit level to connect with the old workings. In 1921 all work on the property came to an end. In 1961 Mr. T.R. Buckham re-staked the prospect.

Mine production started in 1889 and continued intermittenly until 1896. The mine produced again from 1918 to 1921 with the last recorded production occurring in 1969. Most of the production came in 1895 and 1896. Total mine production was 3,109 tonnes with 6,832,553 grams of silver and 2,130 kilograms of lead being recovered.