Step 1: In resuing, waste rock is blasted and removed first, then the ore is blasted separately to avoid dilution.
Step 2: This technique is necessary only when ore bodies are extremely narrow, and mixing waste with ore would drastically reduce grade.
Step 3: Thick or massive deposits do not require such selectivity.
Therefore, resuing is practiced for narrow vein deposits.
An electricity utility company charges ₹7 per kWh. If a 40-watt desk light is left on for 10 hours each night for 180 days, what would be the cost of energy consumption? If the desk light is on for 2 more hours each night for the 180 days, what would be the percentage-increase in the cost of energy consumption?