The MS 4-5 occurrence is located on the south side of Watson Bar Creek at an elevation of approximately 1050 metres.

The region is underlain by mainly sedimentary rocks of the Lower Cretaceous Jackass Mountain Group, cut by several cross faults and splays of the Fraser fault. Intruding the Jackass Mountain Group are numerous dikes and small stocks of quartz feldspar porphyry.

Locally, a major fault, striking 110 degrees, is marked by siliceous breccias and quartz-calcite stock works. Quartz veins and siliceous replacements host disseminated to massive pyrite, arsenopyrite, sphalerite, galena and chalcopyrite. The massive sulphide veins range up to 0.5 metre wide.

In 1987, sampling of the MS 4 vein yielded:

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Sample      Length    Silver            Gold
 (No.)     (metres)  (grams per tonne)(grams per tonne)
1363         0.15      34.3              26.4 
1364         1.22       5.8               2.5
1365         0.20       6.5              25.4
1366         0.23      11.3              11.9
1367         0.61       3.1               7.8
1368         0.15      21.3              15.4
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(Assessment Report 16713)

In 2006, a chip sample (UR4) from a massive sulphide vein assayed 24.7 grams per tonne gold, 0.829 per cent copper and greater than 1 per cent arsenic over 0.4 metre. Another chip sample (UR2) from an oxidized vein assayed 19.5 grams per tonne gold over 0.15 metre (Assessment Report 28628).

During 1983 through 1985, Utah Mines completed programs of geological mapping, geochemical sampling and an induced polarization survey on the area as the Mad claims. In 1987 and 1988, Southern Gold Resources completed programs of geological mapping and rock and soil sampling. In 1997 and 1998, First Point Capital, on the behalf of BHP Minerals, completed programs of rock, silt and soil sampling. In 2006 and 2007, Durfield Geological completed programs of geological mapping, geochemical sampling and an induced polarization survey.