Gr 9 NATURAL SCIENCES: CH 4.3 Extracting ores
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Questions and Answers

What is the primary purpose of removing the topsoil and overburden in surface mining?

  • To create a pit for underground mining
  • To restore the natural vegetation
  • To transport the minerals to the surface
  • To expose the ore for excavation (correct)

    • What is the term used to describe the process of restoring the natural vegetation after mining?

  • Excavation
  • Rehabilitation (correct)
  • Blasting
  • Drilling

    • Which type of mining is used when minerals are located deep beneath the Earth's surface?

  • Open-pit mining
  • Coal mining
  • Underground mining (correct)
  • Surface mining

    • What is the name of the largest open-pit mine in the world, where copper ore is mined?

    <p>Phalaborwa Open Pit Mine</p> Signup and view all the answers

    What is the layer of rock above the mineral deposit called?

    <p>Overburden</p> Signup and view all the answers

    What is the first step in the surface mining process?

    <p>Topsoil removal</p> Signup and view all the answers

    What is the purpose of drilling in the copper mining process at Phalaborwa Open Pit Mine?

    <p>To break down the ore</p> Signup and view all the answers

    What type of mining is commonly used to extract diamonds, gold, and platinum group metals in South Africa?

    <p>Shaft mining</p> Signup and view all the answers

    What is the purpose of the headgear in shaft mining?

    <p>To house the lift system for miners and equipment</p> Signup and view all the answers

    What is the depth of the TauTona Mine in Carletonville?

    <p>3.9 km</p> Signup and view all the answers

    What is the temperature range in the TauTona Mine?

    <p>Up to 55°C</p> Signup and view all the answers

    What method is commonly used in coal mining?

    <p>Room and pillar method</p> Signup and view all the answers

    What is the purpose of continuous miners in coal mining?

    <p>To extract coal and load it onto conveyor belts</p> Signup and view all the answers

    What is the first step in processing ore?

    <p>Crushing the ore into smaller pieces</p> Signup and view all the answers

    What techniques are used to separate valuable minerals from waste rock?

    <p>Flotation, magnetic separation, or chemical leaching</p> Signup and view all the answers

    What is the primary difference between surface mining and underground mining?

    <p>The location of the mineral deposit</p> Signup and view all the answers

    What is the purpose of excavating the ore in surface mining?

    <p>To transport the ore for processing</p> Signup and view all the answers

    What is a common application of surface mining in South Africa?

    <p>Mining coal and manganese</p> Signup and view all the answers

    What is the process of drilling, blasting, and transporting the ore in the Phalaborwa Open Pit Mine?

    <p>Copper mining process</p> Signup and view all the answers

    Why is the overburden removed in surface mining?

    <p>To expose the mineral deposit</p> Signup and view all the answers

    What is the purpose of removing the topsoil in surface mining?

    <p>To preserve the natural vegetation</p> Signup and view all the answers

    What is the difference between surface mining and underground mining in terms of the location of the mineral deposit?

    <p>Surface mining is used for mineral deposits near the Earth's surface</p> Signup and view all the answers

    What is the main purpose of side tunnels in shaft mining?

    <p>To access the ore bodies</p> Signup and view all the answers

    What is a significant challenge posed by working at great depths in shaft mining?

    <p>High temperatures</p> Signup and view all the answers

    What is the primary function of the room and pillar method?

    <p>To extract coal and leave behind pillars</p> Signup and view all the answers

    What is the purpose of crushing and grinding the ore in the processing stage?

    <p>To facilitate the extraction of minerals</p> Signup and view all the answers

    What is the primary benefit of using continuous miners in coal mining?

    <p>They increase the speed of extraction</p> Signup and view all the answers

    What is the purpose of using various physical and chemical processes in the processing stage?

    <p>To extract the valuable minerals from the ore</p> Signup and view all the answers

    What is the significance of the TauTona Mine in Carletonville?

    <p>It is the deepest mine in the world</p> Signup and view all the answers

    What is the purpose of the headgear in shaft mining?

    <p>To house the lift system and allow miners to move up and down the shaft</p> Signup and view all the answers

    What is the primary reason for combining surface and underground mining techniques in some cases?

    <p>To access ore deposits that cannot be reached through a single method</p> Signup and view all the answers

    What is the primary advantage of surface mining over underground mining?

    <p>It requires less infrastructure</p> Signup and view all the answers

    What is the purpose of drilling in the copper mining process at Phalaborwa Open Pit Mine?

    <p>To create a hole for blasting</p> Signup and view all the answers

    What is the primary difference between the coal mining process and the copper mining process in Phalaborwa?

    <p>The type of mineral being extracted</p> Signup and view all the answers

    What is the purpose of the overburden removal step in surface mining?

    <p>To expose the ore for excavation</p> Signup and view all the answers

    What is the primary benefit of rehabilitation after mining?

    <p>It helps restore the natural environment</p> Signup and view all the answers

    What is the primary reason for using surface mining in South Africa?

    <p>It is used to extract iron, copper, chromium, manganese, phosphate, and coal</p> Signup and view all the answers

    What is the primary purpose of using vertical shafts in shaft mining?

    <p>To access deep ore bodies</p> Signup and view all the answers

    What is the main challenge posed by high temperatures in deep mines?

    <p>The impact on the health and safety of miners</p> Signup and view all the answers

    What is the primary purpose of the room and pillar method in coal mining?

    <p>To provide support to the roof of the mine</p> Signup and view all the answers

    What is the primary purpose of crushing and grinding the ore in the processing stage?

    <p>To increase the surface area of the ore to facilitate extraction</p> Signup and view all the answers

    What is the primary purpose of using flotation in the processing stage?

    <p>To separate the valuable minerals from the waste rock</p> Signup and view all the answers

    What is the primary purpose of using chemical leaching in the processing stage?

    <p>To dissolve the valuable minerals from the ore</p> Signup and view all the answers

    What is the primary purpose of the headgear in shaft mining?

    <p>To house the lift system and allow miners and equipment to move up and down the shaft</p> Signup and view all the answers

    What is the primary benefit of using continuous miners in coal mining?

    <p>They continuously extract coal and load it onto conveyor belts for transport to the surface</p> Signup and view all the answers

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