The average copper ore mined in 1900 was 5% copper by weight. Today, the average is .5%. What factors could account for this difference?

Answer 1

Intensive mining over the past 100 years.

Mining tends to extract the highest grade resources first as they are the most economic. But as higher grade non renewable resources are used up lower grades are available and the price rises so long as demand sprays high. So, the industry goes after lower grade deposits.

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Answer 2

The decrease in the average copper content in mined ore from 5% in 1900 to 0.5% today can be attributed to several factors:

  1. Depletion of High-Grade Deposits: Many of the easily accessible, high-grade copper deposits have been depleted over time, leading to the necessity of mining lower-grade ores.
  2. Technological Advances: Modern mining techniques allow for the extraction of copper from lower-grade ores economically. These advancements include improved mining methods, processing technologies, and equipment.
  3. Exploration and Discovery: Advances in exploration methods have led to the discovery of new copper deposits, often with lower grades than those found in the past.
  4. Economic Considerations: Fluctuations in copper prices and market demand influence mining companies' decisions regarding which deposits to exploit. Lower-grade ores may become economically viable to mine when copper prices are high.
  5. Environmental Regulations: Stricter environmental regulations in modern times may limit the exploitation of high-grade deposits in environmentally sensitive areas, pushing mining operations towards lower-grade deposits.

These factors collectively contribute to the shift towards mining lower-grade copper ores in the present day compared to a century ago.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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