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 pure 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 silver x $24.98/oz = $7.90

So the absolute minimum a 1971 silver dollar is worth is $7.90, which is its intrinsic silver value based just on the metal content and weight.

Mint Condition Value:
- For a 1971 Eisenhower dollar in uncirculated mint condition (MS 63 grade), the numismatic value is around $15.
- This is a modest premium over the melt value due to the coin's condition and age, but Eisenhower dollars did have very high mintages.

So in summary:
- A common 1971 silver dollar is worth at least $7.90 for its pure silver weight
- The same coin in mint MS 63 condition is worth around $15 to collectors

The value is higher for superior condition grades or varieties/errors. But the melt value of $7.90 is the absolute floor that the coin would be worth, regardless of condition.