The GRISWOLD (Russnor) copper prospect is located on the west side of Thunder Creek, a south flowing tributary of the North Fork of Bridge River. The occurrence is approximately 2.5 kilometres northwest of Tuber Hill and 42 kilometres west-northwest of the village of Gold Bridge.

The area is primarily underlain by the Early Tertiary-age granitic Bridge River Pluton, which intrudes the Late Cretaceous quartz diorite to the southeast and a similarly aged granodiorite body, the Lord River Pluton to the north, west and southwest. The intrusive rocks are overlain by flat-lying Miocene-age basaltic flows (Garibaldi) and intruded by basalt to diorite feeder dikes and felsite, quartz porphyry and felspar porphyry dikes.

Mineralization consists of disseminated chalcopyrite, bornite and pyrite with trace molybdenite within a breccia zone. Secondary minerals include malachite and azurite. Wallrock alteration associated with fractures and the breccia comprises chlorite, sericite and some potassic. The mineralization is hosted primarily in a possibly 330 degree trending intrusive breccia, partially exposed in an 80m metre long canyon on Thunder Creek.

A 25-metre channel sample taken across this zone in the vicinity of an old adit developed in the breccia, contained 0.80 per cent copper with only trace molybdenum and precious metal values (Assessment Report 3320).

In 2005, a chip sample from the adit yielded 1.84 per cent copper, 0.012 per cent molybdenum, 9.6 grams per tonne silver and 0.25 gram per tonne gold over 1.5 metres (sample 164661; Assessment Report 28271).

In 2011, drillhole RS11-06 yielded 0.043 per cent copper over 189 metres, including 0.103 per cent copper over 18 metres from the southern extension of the breccia zone (Assessment Report 33319).

The area was originally explored by Cominco in the 1930’s. An adit, 62.5 metres long and located at an elevation of 1500 metres, was completed during this time. In 1971, Cerro Minerals completed a program of geological mapping and soil sampling on the area as the Mel and Russnor claims. During 2005 through 2019, Cresval Capital Corp. completed programs of prospecting, geochemical sampling, trenching, an induced polarization survey, 2031.5 metres of diamond drilling in nine holes, an airborne magnetic and radiometric survey and a ground magnetic survey over areas of the property known as the Copper 1-25 claims, the Bridge River project and the Mike property.

In 2010, a 1 kilometre long by 600 metre wide, strong copper-silver-gold soil anomaly was delineated west of the Griswold showing. In 2011, 770 metres of diamond drilling in 4 holes were completed over the Russnor (Griswold) Breccia. Cresval changed its name to Transforma Resources Corp. in October 2021.