The Joan claim, formerly known as the Duplex, is located about 7.5 kilometres east of Slocan City. Access is by the Chapleau Creek and Lemon Creek roads that join the Slocan highway. It joins the Fourth of July No. 6 (Lot 7295) and Teuro Crown-granted claims on the south.

The property was staked prior to 1901 and worked intermittently until 1946. Ore shipments in 1902 and 1947 totalled 9 tonnes, from which 5 kilograms of lead, 249 grams of gold and 20,000 grams of silver were recovered.

The workings consist of two short drift adits (separated vertically by 13.4 metres) and a raise to surface near the portal of the lower adit.

The property is underlain by porphyritic Nelson Granite that is sheared and fractured near the vein. The vein is encountered in the lower tunnel at about 7.6 metres from the portal where it enters the right wall. From this point it is followed in the drift for a distance of about 43 metres to a fault near the face. Along the drift, the vein is offset by three faults with slight left-hand displacements. These strike roughly north and dip 70 to 80 degrees west. The vein is 0.3 to 0.6 metre wide and strikes 130 to 140 degrees, dipping 30 to 40 degrees northeast. The vein consists of quartz (no carbonates) with narrow streaks and disseminations of galena and a minor amount of pyrite and argentite.