Quarry Section
4.83. In the Government Quarries production of aggregate continued to be reserved mainly for the manufacture of road surfacing materials. With the curtailment of quarrying at Hok Yuen Quarry, having reached the limit of economic operation, it was necessary to supplement production by the supply of spalls from private quarries on contract and from development projects. Crushing and the production of coated materials continued at Hok Yuen Quarry.
4.84. A comparison of production of the last four years, including processing of imported spalls, can be made from the following table:
Hok Yuen Mt. Butler Total Total Crushed Stone (Tons) 1961-62 104,886 100,211 205,097 1962-63 98,074 103,297 201,371 1963–64 95,698 87,357 183,055 1964-65 67,979 78,858 146,837 Bitumen Coated Materials (Tons) 1961-62 86,085 30,252 116,337 1962-63 70,186 36,130 106,316 1963-64 85,277 33,674 118,951 1964-65 65,708 29,633 95,3414.85. As an alternative to Hok Yuen Quarry, development of a new quarry at Diamond Hill was put in hand. Site formation was carried out and new plant was delivered for mechanizing the quarrying operations.
4.86. Deep drilling equipment purchased for Mt. Butler Quarry, was put into operation and in combination with the use of Ammonium Nitrate and fuel oil mixtures, single blasts yielding approximately 6,000 tons of rock were achieved.
4.87. Trials were carried out successfully on the manufacture and laying of Asphaltic Concrete in an effort to produce a more durable road surfacing material than the Rolled Asphalt used at present.
4.88. To improve future supplies two additional private quarries were let on long term contracts. The total number of such quarries supervised and administered by the Quarry Section was nine. One of these, Diamond Hill Quarry, was taken over as a Government Quarry as mentioned above, and another was closed on completion of the contract.
4.89. The services of the Quarry Section continued to be called upon for dealing with dangerous boulders where life or property were in danger and where the use of explosives was necessary.
4.90. Courses were arranged for the training of plant operators and several members of the staff were attached for short periods to the Explosive Section of the Mines Division for instruction on the use of explosives and the Dangerous Goods Ordinance.
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Quarry Section
4.83. In the Government Quarries production of aggregate continued to be reserved mainly for the manufacture of road surfacing materials. With the curtailment of quarrying at Hok Yuen Quarry, having reached the limit of economic operation, it was necessary to supplement pro- duction by the supply of spalls from private quarries on contract and from development projects. Crushing and the production of coated materials continued at Hok Yuen Quarry.
4.84. A comparison of production of the last four years, including processing of imported spalls, can be made from the following table:
Hok Yuen Mt. Butler
Total
Total Crushed Stone (Tons) 1961-62 1962-63 1963–64 1964-65 104,886 98,074 95,698 67,979 100,211 103,297 87,357 78,858
Bitumen Coated Materials (Tons) 1961-62 1962-63 1963-64 1964-65
86,085 70,186 85,277 65,708 30,252 36,130 33,674 29,633
205,097 201,371 183,055 146,837 116,337 106,316 118,951 95,341
4.85. As an alternative to Hok Yuen Quarry, development of a new quarry at Diamond Hill was put in hand. Site formation was carried out and new plant was delivered for mechanizing the quarrying operations.
4.86. Deep drilling equipment purchased for Mt. Butler Quarry, was put into operation and in combination with the use of Ammonium Nitrate and fuel oil mixtures, single blasts yielding approximately 6,000 tons of rock were achieved.
4.87. Trials were carried out successfully on the manufacture and laying of Asphaltic Concrete in an effort to produce a more durable road surfacing material than the Rolled Asphalt used at present.
4.88. To improve future supplies two additional private quarries were let on long term contracts. The total number of such quarries supervised and administered by the Quarry Section was nine. One of these, Diamond Hill Quarry, was taken over as a Government Quarry as mentioned above, and another was closed on completion of the contract.
4.89. The services of the Quarry Section continued to be called upon for dealing with dangerous boulders where life or property were in danger and where the use of explosives was necessary.
4.90. Courses were arranged for the training of plant operators and several members of the staff were attached for short periods to the Explosive Section of the Mines Division for instruction on the use of explosives and the Dangerous Goods Ordinance.
43
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