Composed mainly of granite, Bukit Timah Hill was once an active quarrying site in the mid-1900s. The three main quarries at Bukit Timah include Hindhede, Singapore, and Dairy Farm Quarries. Hindhede Quarry is named after Hindhede and Company Limited, established in 1922 by a Danish civil engineer, Jens Hindhede. In granite quarrying, dynamite charges were embedded into the granite hill to blast it into granite chips for use in the construction industry. At noon each day, a loud boom from the granite quarry would signal lunchtime. The company operated the granite quarry until it ceased operations around the late 1980s. A kampong stood at the foot of Bukit Timah Hill at Hindhede Drive up till the 1990s when it finally gave way to luxurious bungalows. The abandoned quarry was later developed into Hindhede Nature Park by National Parks Board and is now a popular spot with visitors who come to enjoy the quarry's scenic beauty. Adventurous rock climbers have also made full use of the disused quarry for their activities.