The Salmon Arm Limestone deposit is situated on the west side of Larch Hills, 245 metres above Highway 97B, approximately 6 kilometres east of the town of Salmon Arm.

A band of limestone of the Hadrynian and/or Paleozoic Silver Creek Formation (Mount Ida Group) forms a small ridge trending 110 degrees along the west side of Larch Hills. The ridge is 250 metres long and 76 metres wide. The limestone appears to dip eastward into the hillside.

The ridge consists of white to bluish white, medium grained, fractured limestone with a few thin seams of brown weathering, blue dolomite along some of the fractures. The limestone also contains some quartz veins and a few inclusions of quartzite and shale. A sample taken across the northwest end of the ridge analysed 54.83 per cent CaO, 0.35 per cent MgO, 1.32 per cent SiO2, 0.21 per cent Al2O3, 0.14 per cent Fe2O3 and nil sulphur (Canada Bureau of Mines Report 811, page 191, sample 51).