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Geotechnical Engineering Office, 20 p. Yim, W. W.S. 1992. Discussion on “Towards a Quaternary stratigraphy for Hong Kong” by J.A. Fyfe. Geological Society of Hong Kong Newsletter, v. 10, no. 3, pp 19 - 22. 157
Sha Tin, Ma On Shan, East New Territories Introduction 24. Industrial Iron Ore Mining in Hong Kong Ma On Shan, 702 m high, is located about 10 km northeast of Sha Tin Town Centre. Iron ore was mined from the area between 1906 and 1976, reaching its climax in the 1960s and 1970s when annual ore production exceeded 400,000 tons. During the 70 years that the Ma On Shan mine was in operation, over 3 millions tons of iron ore was produced. Economic conditions during the early 1970s led to the termination of mining operations in March 1976, and the mine was totally abandoned. Evidence of the past large-scale mining activities, including open mining pits, mining and transport benches, mine tunnels, and ore piles, can still be seen today. The iron ore deposit at Ma On Shan formed within a contact zone between the original limestone bedrock and intruding granite. Percolation of hot mineral-rich fluids from the granite magma altered the limestone bedrock by a process known as metasomatism, which involves silicification to produce a rock called skarn. The resulting iron ore deposit is classified as a typical “post-magmatic skarn mineral deposit”. Skarn-related rocks in the mining area are complex, comprising a very diverse range of minerals. Blasthole drilling in the mining tunnel Today, the underground tunnels and mining chambers are closed for safety reasons. However, a brief glimpse of the scale of the former mining operation can be seen at the surface entrances to the 110 m and 240 m tunnels (adits). The mine transport platform and open mining pit can be also visited. Remnants of the mineralised and silicified rocks that hosted the iron ore still lie scattered about at various locations, especially in the open mining pit and on the transport platform. 157
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Hong Kong Geology Guide Book
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Hong Kong Geology Guide Book Geotec
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FOREWORD Despite having a relativel
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Table of Contents Page Preface 1 Fo
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21. Power of Weathering - Erosion T
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Plover Cove Reservoir, Northeast Ne
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Outline of the Geology Geological M
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Conglomerate overlying horizontally
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Bureau of Geology and Mineral Resou
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How to Get There The Permian sedime
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Guide to Field Observations Because
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Comments Outcrops of Permian rocks
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Kau San Tei, Tai O, Lantau Island I
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ock make up 95% of the Formation. I
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Sediments infilling a groove - tran
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Lai Chi Chong, East New Territories
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Footpath from Pak Sha O to Lai Chi
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Guide to Field Observations The opt
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Newsletter, v. 4, pp 1-4. Sewell, R
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Outline of the Geology Exposures of
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Formation Rock Type Depositional En
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East Ping Chau, Eastern New Territo
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The dolomitic siltstone, particular
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Study of the rock outcrops, particu
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Tai Shek Mo, Lo Wu, Northern Territ
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contact with the Jurassic Tai Mo Sh
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Comments In addition to extensive e
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Tsing Shan Monastery, Tuen Mun, Wes
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Ling Tao Monastery is best reached
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and may have been formed by small-s
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these outcrops stand out prominentl
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References Rock cores with marble c
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Ho Tin Tsuen Service Reservoir, Tue
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Brecciated andesite near Tuen Mun N
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contains very few brecciated clasts
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Shek Lung Kung, Tsuen Wan Chapter 1
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with some quartzite or chert debris
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Comments The Repulse Bay Formation,
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Tai Mo Shan, New Territories Introd
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and quartz, with minor biotite mica
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taken on rock outcrops, and not on
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Nei Lak Shan, Ngong Ping, Lantau Is
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which crop out on the lower part of
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are represented by faults, which su
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Silverstrand Bay / HKUST, Sai Kung,
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Welded tuff, eastern side of Silver
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Comments During the geological surv
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Cape Collinson Road, Siu Sai Wan, H
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Tuff-breccia (1) Tuff-breccia (2) T
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References Allen, P. M. & Stephens,
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Outline of the Geology Access to Lu
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Water Bay Formation, Kau Sai Chau V
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pp 1053-1066. Sewell, R.J., Campbel
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Outline of the Geology Access to th
Page 109 and 110: 1) At the base of many of the rock
Page 111 and 112: plus 14 plates & 3 maps. Fisher, R.
Page 113 and 114: lapilli crystal tuff of the Jurassi
Page 115 and 116: Mafic dyke with xenoliths of quartz
Page 117 and 118: Evolution of a headland, and the fo
Page 119 and 120: Sham Shui Kok, Lantau Introduction
Page 121 and 122: Geological map of Sham Shui Kok (fr
Page 123 and 124: within the feldsparphyric rhyolite,
Page 125 and 126: Sketch of Phase II dykes at Penny
Page 127 and 128: Li, X.C., Sewell, R.J. & Fletcher,
Page 129 and 130: How to Get There Buses from Tung Ch
Page 131 and 132: Joint pattern in Tong Fuk Quartz Mo
Page 133 and 134: and the Lion Rock Suite. A total of
Page 135 and 136: How to Get There The type locality
Page 137 and 138: Pegmatite vein formed in the pluton
Page 139 and 140: References Allen, P. M. & Stephens,
Page 141 and 142: in the properties and appearance of
Page 143 and 144: emains of weathering profiles becom
Page 145 and 146: piping, rilling and gullying. Hong
Page 147 and 148: pace for about half an hour. Pyrami
Page 149 and 150: Stacked stones covering a valley Er
Page 151 and 152: “Broken tortoise head” should b
Page 153 and 154: Lam Tsuen Valley, Tai Po, New Terri
Page 155 and 156: Outline of the Geology The Lam Tsue
Page 157 and 158: (Looking southwestward toward Lam T
Page 159: References Addison, R. 1986. Geolog
Page 163 and 164: silicon and aluminium selectively t
Page 165 and 166: open mining platform, which is loca
Page 167 and 168: Appendix I Outline History and Geol
Page 169 and 170: 500 m in a NE-SW orientation at an
Page 171 and 172: haulage drive at the 110 m level. T
Page 173 and 174: Current condition of Ma On Shan min
Page 175 and 176: Mineral Origin and Occurrence Hardn
Page 177: Mineral Origin and Occurrence Hardn
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