A US Silver dollar weighs 26.73 grams. Of that, 90% is silver and 10% is copper. Note: those numbers don't apply to Eisenhower dollars from the 1970s, which are mostly copper with a bit of nickel.
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Please look at the coin again and post new question, the New Orleans Mint did not strike any dollar coins in 1871
Type in "1871 Liberty Seated dollar coins" in your search box an click images. This will show you the coins.
Keep in mind that not all silver dollars have the CC mintmark. If your coin does have a CC mintmark it would be above the DO in dollar on the back of the coin.
The first Morgan dollar was issued in 1878. Please look at the date again and post new question.
With the flood of counterfeit coins from China even if the weight and diameter are correct it's best to have checked by a professional grading service or take it to a dealer or collector for their opinion.
Please check your coin again and post a new, separate question. Morgan dollars were minted from 1878 to 1904 and in 1921.
Nova Scotian dollar ended in 1871.
British Columbia dollar ended in 1871.
There is no such coin. Canada did not have any coins over 50 cents in 1871.
Prince Edward Island dollar was created in 1871.