Rolling

Northwest Territorial Mint: Rolled Sheet
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Strips Are Rolled

Once the long, thin strips of extruded metal have cooled, they are trimmed using a hydraulic shearer and prepared for rolling. A highly precise instrument called a micrometer is used to calibrate the precise thickness of each strip of metal. Next, the strips are individually fed into a high-pressure rolling machine and gathered for the next step in the process. After each strip has been rolled, it is inspected to ensure that it meets the specifications for thickness.

After the strips have been rolled, they are then sent to the blanking machine.

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Northwest Territorial Mint: Insights & Ideas
Insights & Ideas
Hot Topic: One Sided?

Having a coin made for mounting? This stagecoach bar was made for mounting on the front cover of a large coffee table book. The blanks for this were made from strips of .999 silver that were much thinner than a two sided bar. The reverse was left blank. Such an approach can be done for a wide variety of presentations.

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Northwest Territorial Mint: In The News

The Spy Coin

Silver Dollar Spy CoinIn January 2007, the U.S. Department of Defense issued a warning about a new espionage threat: spy coins. After it was suspected that Canadian coins carried across the border by American contractors may have contained tracking devices, Defense Department officials confirmed that this method of spying posed a legitimate threat to U.S. interests. In fact, in an official report related to the investigation, the CIA revealed that it had previously used hollow U.S. silver dollar coins to carry top-secret messages and film. (Photo courtesy CIA).