The Den 1-10 claims are located on the east side of the Lussier River, immediately north of the Top of the World Park. The claims were staked in July 2000 by Westroc Inc. and a program of geological mapping was completed over the same year.

Locally, gypsum occurs in outcrops over 2 kilometres. Separating the gypsum is limestone of the Devonian Cedared and Harrogate formations. Some of the limestone may belong to the Devonian Bumais formation. The general trend of these units is north-south with gentle dips easterly. An east-west trending near-vertical fault is present at the south end of the claim block. This fault may cut off the gypsum to the south.

The gypsum varies from buff to light grey in the north to cream to very light grey in the south. Some white gypsum is also present in the most southerly exposure. Both the northern most and southern most outcrops have substantial clay content. This is reflected in the analyses of samples taken from these two localities (below). The best quality gypsum is located in the centre the property.

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Sample Number    Gypsum (per cent)  Chlorides (parts per million)
DEN 00-1          78.61                <28
DEN 00-21         95.21                <28
DEN 00-31         91.11                <28
DEN 00-41         70.51                <28
DEN 00-51         81.01                <28
DEN 00-61         78.41                <28
(Assessment Report 26465)
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In 2019 the Denby 1- 5 mineral claims were staked on behalf of Homegold Resources Ltd. Prospecting and geological sampling were focused on the west side of the Lussier River across from the Den gypsum zones where work in 2005 indicated the presence of gypsum over a length of 2000 metres. Eight samples were collected in 2019 along the main access road but assay results were low in P2O5 (Assessment Report 38470).