Step-by-step explanation:
The gold used for the 1875 twenty dollar piece, also known as the Double Eagle, was primarily sourced from domestic gold mines in the United States. The coin contained 0.9675 ounces (approximately 33.436 grams) of gold and had a face value of twenty dollars. The gold used in these coins was of a standard fineness of 0.900, meaning it was 90% pure gold, with the remaining 10% consisting of copper and silver alloy for added durability.