A Mining Company was founded in 1894 and the mineâ€™s initial production was the extraction of 100kg/year of silver. Each following year saw a steady increase of 60kg/year until the silver production peaked at 700 kg/year. Production remained at this level until 1914, when an event caused the mine to close indefinitely. The company then stopped its mining operations on the claim during the First World War (1914â€“1918). In 1920, the company opened up a new second mine which, in the first year, saw a silver yield of 700kg/year. However, with every subsequent year, production decreased by 8%. For economic reasons, the new mine had to close when the production fell below 300kg/year.

1. When did the first mine reach the peak production of 700 kg/year? I figured it out to be 1904, but I didn't use the formula. How should this be worked out?

3. Compare the production of both mines over the first five years. Find the total production figures of the two mines until that ceased operation. which of the two mines was more successful? I think I got 5 years.

4. Calculate the percentage of gold remaining in the ground after all mining operations ceased. No idea.

1. When did the first mine reach the peak production of 700 kg/year? I figured it out to be 1904, but I didn't use the formula. How should this be worked out?

3. Compare the production of both mines over the first five years. Find the total production figures of the two mines until that ceased operation. which of the two mines was more successful? I think I got 5 years.

4. Calculate the percentage of gold remaining in the ground after all mining operations ceased. No idea.

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