Rose Lake is located 100 metres east of the BC Rail line, six kilometres northeast of 70 Mile House.
The lake is a semi-evaporitic playa lake. It is located in the "Green Timber Plateau" area (EMPR Bulletin 4), a semi-arid plateau area averaging 1130 metres elevation which is part of the Cariboo Plateau and host to several playa lakes. The area is underlain by alkaline plateau basalt flows of the Miocene to Pleistocene Chilcotin Group, mantled by a thin cover of glacial till and glaciofluvial sediments. Annual precipitation averages between 300 and 400 millimetres (EMPR Paper 1991-1).
Rose Lake contains sodium carbonate-rich brine and "winter crystal" (natron or hydrated sodium carbonate). It covers an area of approximately 12 hectares and is covered with brine to an average depth of approximately 60 centimetres. At the end of the dry season in 1937 (EMPR Bulletin 4, page 21) no "winter crystal" had formed, nor had it formed for several years. However several thousand tonnes were harvested between 1924 and 1929. The brine had a density of 1.0795 and contained 8.17 per cent dissolved solids composed of 95.8 per cent sodium carbonate, 3.9 per cent sodium chloride and 0.5 per cent sodium sulphate. Canadian Occidental Petroleum staked the Soda 10 and 11 claims in 1989, collected a water, a mud and a winter crystal sample and completed analyses for sodium carbonate and other alkalai salts (Assessment Report 20080). Canoxy also completed an airborne infrared survey to test for dissolved solids in the lakewaters. In 1993, the lake was re-staked as the CSW 5 and 6 claims by Mr. G.M. Rogers (Assessment Report 23127) who collected six water samples to test for the presence of natron winter crystal. None was found.
In 2010 Lomiko Metals Inc. acquired 100 per cent interest in the Rose Lake deposit.