The Anna occurrence is located near the top of Monarch Mountain about 5 kilometres southeast of the community of Atlin.

The showing is situated in an area underlain by serpentinized peridotite of the upper Mississippian to Permian Cache Creek Complex. These rocks are spatially related to the Mississippian to Triassic Cache Creek Complex and Monger (Geological Survey of Canada Paper 74-47) believes that they may be genetically related as well. The showings occur where these ultramafics have undergone a severe deformation and alteration associated with faulted, crumpled or brecciated zones. These rocks are highly altered (listwanitic) schistose ultramafics composed of talc, magnesite, siderite, quartz, chalcedony, mariposite, chromite and pyrite. A shear zone adjacent to this altered zone has been intruded by basaltic lavas. A granitic dike approximately 10 metres thick is also reported. Rocks adjacent to this dike have similar talc-carbonate type alteration. Quartz veins cut the contacts of dike. A similar northeast trending, steeply dipping fault zone with listwanitic alteration hosts the Gold Star showing (104N 091) located 6.3 kilometres northwest.

Quartz veins up to 0.5 metre thick cut these altered ultramafic rocks and are reported to have a trend of 130 degrees with vertical dips. In 1984, a sample of "quartz vein talc and/or carbonate-bearing rocks" yielded values of 1.75 grams per tonne gold and 19.58 grams per tonne silver (Assessment Report 12385).

In 1983-84, owner/operator B. Lueck conducted prospecting on the Anna 1-8 claims.