The Sylvester K (Lot 2382) claim and adjoining Marshall (Lot 2388) claim (082ESE031) are centred near Providence Lake, 1.7 kilometres northwest of Phoenix and 5.8 kilometres northeast of Greenwood. Access is via the Providence Lake road which runs north from the Phoenix mine site.

There are no records of ore being processed or shipped from Sylvester K. Ore was shipped from the Marshall claim in the period from 1967 to 1975.

On the Sylvester K claim, numerous old hand dug pits and trenches are evidence of the early exploration. The claim was Crown granted in 1900. In 1982, following the discovery of an electromagnetic anomaly, trenching with a backhoe revealed sulphides (Discovery zone) in rough alignment with mineralization on the Marshall claim. This was confirmed in 1983 with more extensive trenching and a program of 20 test holes totalling 1900 metres of diamond drilling. Drilling on the Discovery zone delineated approximately 50,000 tones of mostly low-value pyritic ore in a zone 240 metres long and 1 to 6 metres wide. Spot gold grades within this zone locally exceed 10 grams per tonne. Indicated ore is estimated at 50,000 to 100,000 tons of 8.6 grams per tonne gold (Kettle River Resources Ltd., Exploration Update, February 1986, according to National Mineral Inventory card 082E/2 Au10). Drilling on the New York zone, 85 metres east of the Discovery, intersected 3 metres of 5.3 grams per tonne gold (GCNL #150 (Aug.5), 1983).

The principal rocks underlying the Sylvester K and Marshall claims are sedimentary units of the Triassic Brooklyn Group and offshoot apophyses and dikes of the Lower Jurassic Providence Lake microdiorite stock. The Brooklyn beds are steep, mostly easterly dipping, comprising thick basal sharpstone conglomerates, overlain by a relatively thin transitional argillaceous facies, and a thick upper limestone unit. The Providence Lake microdiorite stock, dated 206 Ma, intrudes the limestone and conglomerate, feeding the somewhat younger volcanic rocks of the Eholt Formation (Brooklyn Group).

Mineralization comprises stratabound massive sulphides in limestone lenses and sulphide disseminations in the accompanying sharpstones and argillaceous rocks of the Brooklyn sequence. The ore mineralogy consists principally of pyrite and smaller amounts of pyrrhotite and marcasite, and traces of chalcopyrite accompanied by carbonates, quartz, and chlorite. The effect of the mineralizing solutions on wallrocks of the ore zone is well displayed in the Sylvester K zone where the footwall argillites have been transformed locally into a fine grained biotite bearing hornfels. Here numerous thin pyrite stringers carry gold and silver values for more than 10 metres distal from the massive sulphide bodies. Elsewhere, chlorite and hematite are common on joints and cracks in the host rocks.

Source of the mineralizing solutions is believed to be the microdiorite stock, although no significant mineralization is visible south of Providence Lake where the main microdiorite body intrudes the Brooklyn limestone. However, considering the wide distribution of microdiorite dikes in the area, it is possible that the principal plutonic body lies at depth.

Echo Bay Mines Ltd. drilled 10 holes totalling 1056 metres in 1997.

In 2016, Golden Mineral Inc. sampled a large trench exposing a 2.2-metre thick massive sulphide lens and adjacent quartz stockwork zone. A continuous channel sample across the south wall of the trench averaged 9.92 grams per tonne gold over 15.2 metres with individual samples yielding up to 28.2 grams per tonne gold, 6.3 grams per tonne silver and 0.116 per cent copper (Ball, M. (2017-01-26): Technical Report on the Greenwood Area Property).