The Senator mine, previously known as the Batchelor and Midnight, is located on the south side of Memphis Creek (formerly Twelvemile Creek) about 1.0 kilometre east of the Slocan highway, 6 kilometres north of Slocan. The Senator claim (Lot 15828) lies immediately east of the Homestake claim (Lot 15283)(082FNW213) and south of the V. & M. (Lot 4260) and Get There Eli (Lot 4261) claims (082FNW191).
The property is underlain by broken and foliated porphyritic Nelson granite. The workings consist of 2 adits, one 61 metres long, on a quartz vein averaging 1.2 metres in width. The vein strikes 030 and dips 47 degrees southeast. In 1906 and 1907, the Midnight produced 20 tonnes of ore, yielding 43,420 grams of silver and 436 grams of gold. In 1939 and 1940, the Senator produced 13 tonnes of ore, yielding 187 grams of gold and 17,947 grams of silver.
In 1948, the property was held by the Spokane Slocan Company. In 1988, Yukon Minerals Corporation conducted soil and rock sampling, and geological mapping in the area. A sample from the Senator adit assayed 6.1 grams per tonne gold and 1080 grams per tonne silver over 0.3 metre on a quartz-pyrite vein (Assessment Report 18603).