The Northern Crown occurrence is located on the eastern side of the Clayoquot River, approximately half way between Clayoquot and Kennedy Lakes.

The skarn deposit occurs in limestone of the Upper Paleozoic Buttle Lake Group (correlative with the Pennsylvanian to Permian Azure Lake Formation of the Buttle Lake uplift) near its contact with dioritic rocks. The intrusives may be part of the Mesozoic and/or Paleozoic West Coast Complex, which mapping shows to be in contact with the limestone to the west, or they may have affinity to an intrusive stock of the Tofino Intrusive Suite located a few kilometres to the southeast.

Mineralization consists of pyrrhotite, chalcopyrite and pyrite, along with garnet and epidote. A sample taken across about 1 metre assayed 8.4 per cent copper, 27.43 grams per tonne silver and a trace of gold (Minister of Mines Annual Report 1918, page 263).

Development work done in the early part of the century consisted in part of at least 20 metres of tunneling. In 1987, W. Guppy prospected the area as the Jem 1-2 claims.