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Asteroids may be called minor planets in that they are like Earth or the other planets but much smaller. The idea of asteroid mining is that objects like these that are relatively close to Earth could be mined for substances that are either (a) becoming scarce here, or (b) would be useful or valuable in making journeys to more distant places. There's an article about asteroid mining on wikipedia.
It is an Alkaline Earth Metal
The main element in steel is usually iron. It also contains small amounts of other substances, to improve its properties. Often it contains some carbon (not a metal), and sometimes smaller amounts of other metals.
Gold is an unreactive metal and can be found in the pure metallic form.Aluminum is a very reactive metal and can only be found combined with other elements as aluminum ores. These ores are readily mined both underground and in open pits.
iron
Nope. It is its' own metal. It is mined from the ground just like any other metal.
bfty
Rock material mined for its constituent elements or minerals is called "ore."
a pancake
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it reuses it
Thorium can be strip mined and it could be deep mined. It is be produced as a byproduct of the production of rare earth elements, and since the current production as a byproduct far exceeds the demand, it is not usually mined.
Wood, metal & other substances
wood, metal and other substances.
After diamonds are mined, the bulk deposit of earth is loaded into a truck and driven to a sorting belt, where the deposit is processed to separate the diamonds from the other material collected in the scoop.
All those metals are considered to be Earth Elements, or substances that can be found on Earth and are pure since they can not be broken down into any other substances.