How much is a 1971 silver dollar worth in weight and in mint condition? 

This coin, regardless of condition, is worth at least its weight in silver. The silver melt value for this coin is $7.90 as of April 10, 2023. This melt value is calculated from the current silver spot price of $24.98 per ounce. The standard 1971 silver dollar is worth around $15 in MS 63 choice uncirculated condition.
Here are the key details about the value of a 1971 silver dollar:

Weight Value:
- The 1971 Eisenhower dollar contains 0.3161 troy ounces of silver
- At the current silver spot price of around $24.98 per ounce (as of April 10, 2023), the melt/bullion value is:
0.3161 oz x $24.98 = $7.90

So the absolute minimum a 1971 silver dollar is worth is its silver melt value of $7.90, regardless of condition.

Mint Condition Value:
- In uncirculated mint condition (MS 63 grade), a 1971 silver Eisenhower dollar is worth around $15
- The value increases for higher mint state grades above MS 63
- Proof versions from the U.S. Mint can be worth $20 or more in PR 65 condition

So in summary, a common 1971 silver dollar is worth a minimum of $7.90 for its silver content. But one in mint uncirculated MS 63 condition is worth around $15 to collectors. The value goes up further for higher grades or proof versions.