According to the pilot, his release from the tow plane was normal. The pilot released the tow rope at 7,100 feet mean sea level (msl) while over a 6,500-foot mean sea level (msl) mountaintop for a planned 1/2-hour sightseeing flight. Little to no indication of lift was noted in the area, and the pilot reversed course. When the glider had descended to 6,900 feet msl and was continuing to rapidly descend, the pilot again reversed course toward lower elevation terrain. The glider’s altitude was insufficient to clear a ridgeline. On the side of the mountain, about 6,400 feet msl, the glider impacted rocks, trees, and shrubs, which resulted in breakage of the glider’s wings, and serious injuries to the pilot.