The Dease Lime showing area is located about 18 kilometres east-southeast of the community of Dease Lake.

The occurrence covers a large exposure of the Upper Triassic Sinwa Formation (Stuhini Group) and is described as massive, recrystallized, and strongly fractured limestone, which weathers light grey, may be strongly brecciated, and contains detrital quartz and very rare corals.

Bedrock exposed at the showing consists almost exclusively of fine- to coarse-grained limestone with a variable, but generally quite small component of argillaceous minerals, and a light to dark grey fresh surface. Some local gossanous weathering is apparent. Whole rock analysis of rock sample 178320 yielded 56.15 per cent calcium oxide (Assessment Report 31067).

In 2009, a prospecting and rock geochemical sampling program conducted by Hard Creek Nickel Corp. concluded that there exists a carbonate body of appropriate composition and size to potentially be of use in future metallurgical processes at the proposed Turnagain Mill.