<P> Section 105 authorized the secretary to prohibit the melting, export, or treating of any coin, if necessary to protect the nation's coinage, and prescribed a penalty of up to five years in prison for violation of such an order--section 106 declared that coins seized under section 105 would be forfeited to the United States, with the secretary given powers paralleling those under the Internal Revenue Code to enforce such forfeitures . Section 107 allowed the secretary to issue regulations to put into force the Coinage Act of 1965, while section 108 contained definitions and similar technical matters . </P> <P> Section 201 amended legislation regarding the San Francisco Assay Office to allow coins to be minted there (as they previously were when it was the San Francisco Mint) until such time as the secretary certified that the mints of the United States were able to strike sufficient coins to meet the needs of the nation . It also repealed a provision of law not allowing gold or silver to be refined at the San Francisco facility . Section 202 increased the amount appropriated to expand Mint facilities (including the construction of the new Philadelphia Mint) from $30 million to $45 million . Section 9 of the Gold Standard Act of 1900 had required the Treasury Secretary to melt silver coins that were worn or no longer current, and restrike them into new ones; this was repealed by section 203 and the secretary was given authority to withdraw and melt all worn or uncurrent coins without needing to reuse the metal in coinage . </P> <P> Section 204 amended the Coinage Act of 1873, which required the year of striking to appear on coins . During the 1965 or subsequent coinage emergency, the secretary could continue to strike coins dated with a year that has passed, with the silver ones in the present crisis to be dated 1964, and the clad ones 1965 or after . The House Banking Committee added language to Johnson's proposal, eliminating mint marks on coins for up to five years, excepting the mint mark "D" for Denver on 1964 - dated coins struck there . </P> <P> A bullion fund was authorized under previous law within the Mint; section 205 allowed purchases of silver made under section 104 to be paid for from this fund . Another Mint account, the minor coinage metal fund, used to purchase copper and other metals for cents and nickels, was redesignated the coinage metal fund by section 206, usable for all denominations, and that section eliminated statutory limits on how much money can be in that fund . </P>

When did they stop making pure silver quarters