March 12/14-A Bell 206B helicopter, C-GALR, operated by Alpine Helicopters was providing heliskiing support services on Mt Chapman (Revelstoke, 55 nm N). The pilot plus one guide were on board to deliver a catered mountain-side lunch service to customers skiing on the mountain. The helicopter set down right side low on the chosen sloping landing site and remained partially supported by the rotor. The pilot attempted to move to a different site nearby, but a skid dug into the snow and the helicopter entered a dynamic rollover condition and fell to the ground on its right-hand side. There was no fire nor were there injuries. The helicopter was substantially damaged.