The Y.R. occurrence is located on the west side of Madson Creek, a tributary of Watson Bar Creek, at an elevation of approximately 998 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 north trending argillaceous layer within a sandstone assemblage has been partly replaced by quartz and carbonate with limonite alteration. The horizon ranges to 1.1 metres in width and has been intermittently exposed over 120 metres. The horizon has been disrupted by narrow shears along which small lenses of quartz host chalcopyrite, arsenopyrite and pyrite mineralization. Minor amounts of stibnite and cinnabar are noted in the replacement zone.

In 1984, a sample (84MPT-006) assayed 18.6 grams per tonne gold. Another sample (84MPT-037) taken a few hundred metres up the creek assayed 0.338 per cent copper, 0.222 per cent antimony, 2.0 per cent mercury, 18.9 grams per tonne silver and 0.86 gram per tonne gold (Assessment Report 13019).

In 1987, a sampling of the zone yielded:

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Sample      Width        Gold
 (No.)      (metres) (grams per tonne)
 1377         0.10        15.10
 1400         1.00        10.93
 1401         0.80         5.96
 1402         1.00         3.61
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(Assessment Report 16823)

In 1988, twenty-seven samples from the zone yielded values from 0.02 to 9.91 grams per tonne gold (Assessment Report 17781).

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.