The airline transport certificated pilot was landing a tundra tire-equipped airplane at a remote landing spot at the conclusion of an on-demand passenger flight. The pilot said the landing area was a rocky ledge, about 900 feet long, and about 12 feet wide, located along the edge of a glacier, about 5,500 feet msl. During the landing roll, the right main landing gear collided with a rock, and the gear collapsed. The right wing struck the ground, and received damage to the wing spar. The pilot indicated that the visibility in the area consisted of hazy conditions with smoke and light rain.