1.stonyfell quarry started the early stages of open cut mining, or quarrying, in 1837. It mines sandstone quartzite rock, and has been most commonly used as aggregate on Adelaide suburban roads. In 1943, Greenhill quarry started its productions less than a kilometre away, creating competition between the two. Boral energy bought both operations in 1979, and joined them to create a more profitable source.

Stonyfell quarry was an expensive mine to run full time, with machines needing to be replaced frequently, and equipment being so expensive. It decided in the early 90's that now historic quarry only needed to run half time to maintain profitability.

2. Most of the material extracted from this open cut mine is done by blasting or drilling. The bench -cut quarry produces quartzite sandstone blocks 1ftx 1metre. It can then be crushed into different sizes, depending on the use, eg. * Primary crushed rock, 200mm, * secondary-80mm

* Tertiary (aggregate)-20mm *quaternary (sand) 4mm

There are more than 25 uses for this quartzite sandstone, including building materials, road aggregate and railway ballast. The material

Open cut mining on surfaces such as the hills at Stonyfell, are high in kaolin clay and quartzite sand, so when binding topsoil and plants are removed, erosion occurs. This causes runoff channels and washes clay and silt into waterways, blocking streams and affecting the marine life, even at the ocean.

3The beautiful Adelaide hills act as a backdrop for the plains city and suburbs. 1962 brought in a new planning act, preserving the hills face zone from any further development. This was a problem for Stonyfell as many of their quarried hillsides were visible from the city. This was an eyesore and problem for surrounding environment.

With this funding, a series of dams were built, in order to catch runoff from the quarry slopes. Each year they save 500 tons of sediment from invading our waterways, though some is still found in Kensington, Stonyfell creeks, and the Torrens River. Sediment caught is mixed with soil or aggregate to sell.

Some common words found in the essay are:
Industry Field, River Sediment, stonyfell quarry, extractive industry, Kensington Stonyfell, surrounding environment, quartzite sandstone, sandstone quartzite, cut mining, quarry started, facing slopes,
Approximate Word count = 810
Approximate Pages = 3 (250 words per page double spaced)