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Ruby corundum
Ruby mining ↓
Igneous rocks and metamorphic rocks are the key factors for the formation of corundum gems. The secondary deposits come from the places where these main rocks are most likely to be mineralized. If so, we can look for gems in such a vast place and in more specific places.
The tried and tested elutriation technology is one of the most common and useful exploration methods. Basically, it includes exploring river gravel. Because of its highly determined specific gravity, corundum is usually concentrated in rivers and streams. Exploration includes sampling the gravel layer of the river from the downstream of the river. When very fine corundum is found, people regularly work from downstream to upstream and take samples along the way. Ended up with nothing. Then the next step is to go back and locate the exact location of the original trace of the gem. From here, further samples will be taken on the banks of suitable rivers and streams that produce corundum.
Working upstream will hopefully bring a piece of corundum to the original rock. However, theory is often simpler than practice, and this method has been used to find mineral deposits in history.
Most rubies in the world are found in small alluvial deposits. The more precious things are, the worse their growing environment is. Similarly, the mining conditions of rubies and sapphires are also very difficult. Ruby from Myanmar, for example, usually needs to be stripped off to a thickness of 15 feet to reach the gravel layer containing gems. Then, mining can really proceed.
How is the mining operation completed? First, remove the huge boulders, then concentrate the pebbles containing precious stones in a certain place and screen them with a set of wire mesh screens. The main steps are divided into three steps: the first step is to remove the largest stone in the top screen; Secondly, the medium gravel on the secondary screen is removed; Step three, leave the smallest gravel on the third sieve. The gravel has been selected, how to choose the gem? The general operation method is: one hand holds the tool to remove the gravel, and the other hand picks the gem. Put the selected gems into the bamboo basket and push the selected gravel off the table. Because there may be pebbles in the abandoned gravel, you can continue to pick them by hand.