The Clipper Fraction (L.1423S) occurrence is located southeast of Twin Creek, at an elevation of approximately 1350 metres and 4 kilometres east of the community of Greenwood.

The Greenwood-Grand Forks area contains Upper Paleozoic and Mesozoic volcanic and sedimentary rocks, mainly in the greenschist facies of regional metamorphism, which are intruded by Mesozoic plutons and unconformably overlain by Tertiary volcaniclastic and flow rocks. The pre-Tertiary stratiform rocks are contained in a series of five, north dipping thrust slices with bounding faults, which at many places are marked by layers and lenses of deformed serpentinite. These thrust slices lie above high-grade metamorphic complexes.

The Upper Paleozoic rocks in the Greenwood area are Devonian to Permian Knob Hill Group chert, greenstone and related diorite and serpentinite and Carboniferous to Permian Attwood Group dark-grey argillite, limestone and minor volcanic rocks. They are unconformably overlain by the Brooklyn Formation of clastic sedimentary rocks, limestone and largely submarine pyroclastic breccias and related dioritic intrusions. These rocks probably formed in an environment of growth faulting and explosive volcanism (Open File 1990-25).

The distribution of the Tertiary rocks is controlled by a complicated array of extension faults. Three sets are recognized. The oldest are gently east-dipping, at or near the base of the Tertiary. Later, dominantly west-dipping, listric normal faults have caused rotation so that the Tertiary strata dip to the east at moderate angles; the apparent offset on each of the five of these faults is measured in kilometres. The third and latest faults are north to northeast-trending, steeply dipping, strongly hinged and influenced by the earlier faults.

Locally, a conglomerate is reported to host a series of at least three subparallel mineralized quartz veins, up to 0.6 metre wide. The veins trend north-northwest. Mineralization was not described.

In 1985, samples from the veins yielded up to 11.35 grams per tonne gold and 1516 grams per tonne silver over narrow widths (Property File - Skylark Resources Ltd. [1985-06-01]: Map - Plan Showing Claims, Geology and Surface Features - Skylark group).

The area has been explored since the early 1900s in conjunction with the nearby Skylark (MINFILE 082ESE011) and Surprise No.3 (MINFILE 082ESE260) past-producing mines. During the 1980s, the area was examined by Skylark Resources Ltd.