Abstract: A drilling apparatus includes a platform for positioning at a drilling site) a mast pivotally mounted on the platform) a rod clamp on one end of the mast for clamping a drill rod) a drill head slidably mounted on the mast for driving the drill rod during a drilling operation, a main ram connected to said mast and said drill head for moving the drill head longitudinally of the mast) a casing clamp on the rod clamp for clamping the mast to a top end of a casing carrying the rod) whereby the mast is anchored to the ground during drilling) and a drill head slidable on the mast for driving the drill rod during drilling.

Abstract: A drilling apparatus includes a platform for positioning at a drilling site, a mast pivotally mounted on the platform, a rod clamp on one end of the mast for clamping a drill rod, a casing clamp on the rod clamp for clamping the mast to a top end of a casing carrying the rod, whereby the mast is anchored to the ground during drilling, and a drill head slidable on the mast for driving the drill rod during drilling. By anchoring the apparatus to the bedrock during drilling a core sample removal, the apparatus cannot become misaligned due to reaction forces between the drill and the ground.