The Crown occurs at the contact of grey and white limestone with dark grey to black limey argillite. The area is mapped as rock of the Missippian to Lower Permian Milford Group . The property was developed by two adits and a number of open cuts.

The No. 1 adit follows closely spaced branching faults that strike northwest and dip steeply southwest. Locally they carry white quartz and pyrite. The No. 2 adit follows the contact of argillite and limestone. Gossanous rock is exposed in the adit and trenches to the north. This gossan contains a few narrow calcite-siderite veins and locally minor pyrite, galena and sphalerite. The workings from which gossanous rock run 3291 grams per tonne silver were collected are located 100 metres south of adit No. 2 (Bulletin 53).

In 4 years from 1962 to 1972, 139 tonnes of ore were shipped from the Crown property. From this ore, 158,377 grams of silver, 4,477 kilograms of lead and 5,961 kilograms of zinc were recovered.