Abstract
Planning and maintaining intact pit slopes in a quarry/mine pit is an important aspect for a sustainable quarry development and operation. It is a main concern in ensuring the constructed pit slopes and benches are stable and safe during quarrying operation activities as well as after permanent closure of a quarry pit. An appraisal for slope instability and failures is conducted at the quarry pit of the Lafarge Rawang Sdn. Bhd. which is located in Rawang, Selangor. Determination of the failures level, integrity and governing geological parameters the contributed to the failures, stability and the hazards are done by field observation, geological mapping and geophysical surveys. The earth resistivity and seismic imaging surveys were conducted to image the subsurface condition such as extent and thickness of limestone bedrock and overburden, including suspicious features like the presence of underground seepage, sinkhole and soil/rock inferred strength indirectly. Occurrences of a few slope failures are considered minor, small scale and localized in nature. The rock slope failures mainly due to structural parameters of the in-situ rock which imposed a heavy jointing intersection and rock bedding plane that coincidently constructed parallel to pit slope face.
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