Exploitation of Handcraft Gold
The system of handcraft exploitation is used by 95% of the miners at a certain area of a developing country, due to its low investment and maintenance costs, the use of workers for the movement of lands with shovels and picks, manual washing by wheelbarrows and an inclined wooden plank, ridge of a gable roof and sluices of the same material, use of a perused iron which can be used as a cribble or zaranda (cylinder iron) and placed on top of the slues which is structured of plastic.
The extraction is performed in beaches of auriferous deposition yearly (in time of rains the rivers grow and pull the sediments), its exploitation is in low-water mark, parallel, works of extraction of gold in auriferous lens of paleo-cause which are generally buried at 2 to 5 meters of depth are performed, with horizons covered by vegetation of developed forests, for which its exploitation implies the rubric of drilling, burning, cleaning and excavation of overweight, etc.
The concentrates obtained are washing troughed in wooden pots previously amalgamated with mercury, burned and refogated with coaled carbon, the mercury is lost by the temperature.
Advantages
- Investment for work unit no higher than US$ 3,000.
- Immediate production and return of capital.
- It requires minimal experience.
- Possibility of moving immense masses of humans through planning of depressed areas.
Disadvantages
- Scarce movement of auriferous material;
- Sacrificial and fatiguing mining activity;
- Difficulty in getting workers;
- Its exploitation is limited only until the freatic level;
- Beds are lost due to limiting work;
- The loss by sluices 25 to 30% of gold;
- A control and dis-embattling of slues every 30 alimented wheelbarrows.
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