The BM showing is located approximately 1.2 kilometres west of Lea Lake and 10.4 kilometres north-northeast of the village of Horsefly. It is within the Cowtrail property as are the Cowtrail (093A 266) Hook (093A 112) and Middle Lake (093A 360) showings. Access to the area is provided by a paved road from 150 Mile House to Horsefly, and then several bush roads from ranches occupying the Horsefly River valley.
The oldest rocks on the Cowtrail property belong to the Upper Triassic-Lower Jurassic Nicola Group and consist of a submarine sequence of augite basalt flows and wackes that are overlain by massive felsic tuff breccias (probably volcanic equivalents of crosscutting alkalic intrusions), which in turn are overlain by a dark grey siltstone. The youngest units are maroon-coloured analcite-bearing basalt flows and breccias of probable subaqueous origin. Four intrusive centres are known to exist on the Cowtrail property including the "Lea Lake" intrusive, ‘Middle Lake" alkalic entity’, the "Hooker Lake syenodiorite" and the carbonate altered "BM" felsic unit. Two of the known intrusive centres, the Middle Lake entity and the Hooker Lake syenodiorite, may be coeval with the younger volcanic lithologies and are probably subvolcanic in origin. They occur as virtual windows in a till-covered terrain and may coalesce under this cover.
In 1974 the BM Showing, a zone of strongly carbonate-argillic altered intrusive, was discovered by Domes Mines. The BM showing is defined as propylitic alteration with pyrite, epidote, calcite, chlorite, actinolite and minor garnet and chalcopyrite in a dark grey to black analcite-pyroxene basalt (EMPR P 1987-01 pp. 125-131, Fig. 3-1-2).
From 1987 through 1991, R.M. Durfeld conducted geological mapping, soil, rock and stream sediment sampling over the Cowtrail property, mostly to the west of the Hook showing anomaly and including the BM showing area (Assessment Report 17647). Eastfield Resources staked part of the Cowtrail property area in 1991 and optioned it to Cogema Canada who later that year contracted an airborne geophysical survey to Aerodat which was followed up with a soil geochemical program (Assessment Report 22086). The airborne survey data was not recorded for assessment.
The area was re-staked by Wildrose Resources Ltd. in 2004 as the Cowtrail property, to cover airborne geophysical anomalies derived from surveys completed in 1967 and 2004 and also to cover the original BM and Hook (MINFILE 093A 116) showings. Subsequent airborne magnetometer surveying, completed by the BC Ministry of Energy, Mines and Petroleum Resources in 2003 and released in 2004 (Open File 2004-9), shows a well-defined total field magnetic feature extending northwest from the Middle Lake Stock to the BM showing area. The magnetic feature is 2.1 kilometres long and varies from 450 to 650 metres in width.
In 2025, Wildrose Resources Ltd. (now Cariboo Rose Resources Ltd.) subsequently granted an option to Dajin Resources Corp. to earn a 65 per cent interest in Cowtrail. From 2005 to 2011 Dajin Resources Corp. conducted rock and soil geochemical surveys and ground IP and magnetometer surveys resulting in target areas for 2007 and 2011 drill programs.
Two drill holes investigated the BM area anomaly in 2007. Hole 07-DDH-04 intersected several weakly mineralized basaltic and dioritic sections with maximum values of 0.078 per cent copper and 0.072 gram per tonne gold. Trace molybdenum was also detected near the bottom of the hole. Drill hole 07-DDH-05 mainly hit zones of a “porphyritic andesite that contains abundant phenocrysts of plagioclase” and “porphyritic hypabyssal potassic diorite that contains scattered phenocrysts of plagioclase". The hole was anomalous in gold, lead and zinc from 124.1 to 148.4 metres downhole with maximum gold values of 0.098 gram per tonne, lead at 0.068 per cent and zinc at 0.15 per cent (Assessment Report 30539).
In 2021, Cariboo Rose Resources conducted a soil survey over the BM area in the northwest region of the Cowtrail property (Assessment Report 40594).
In 2023, 5 NQ diamond drill holes totalling 690.68 metres were drilled by optionee BRS Resources Ltd. on the Cowtrail property with 2 being in the BM anomaly area. Drill Hole CT23-18, collared 500 metres east of the BM showing, cut intercalated fine to medium-grained diorite and hypabyssal andesite and intersected 6.0 metres of 0.82 gram per tonne gold which included 3 metres of 1.184 grams per tonne gold and 0.12 per cent arsenic. CT23-19, collared 450 metres southeast of the BM showing, encountered hypabyssal andesite and returned 3.55 metres of 0.11 per cent copper from the final sample of the hole, which was abandoned at 47.55 metres in bad ground (Assessment Report 41403).
For a more detailed Cowtrail property history see Cowtrail (DDH01) (MINFILE 093A 266).
