Have you been to Singapore Quarry? Where?

After having lunch at Bt Timah Food Center we went for an unplanned adventurous trail, Daily Farm Nature Reserve. Unfortunately we couldn't find the place. 2 fellow in their fancy trekking suits told us there is this "Singapore Quarry" nearby... We could have parked our car near the MOE adventure Center and walk the trail all the way to the so-called quarry. However we chose to park at the nearest spot and walked the shortest route. Parked at Jalan Asas behind The Rail Mall and just walked for about 0.7km.
There is basically a very huge piece of rock, a waterbody, a platform, a shelter & very hot weather.