the coining of money is approved by ( house senate or both)?

Answer 1

In short... coining money falls under the jurisdiction of the Treasury Department not Congress. Congress just created the mint through a normal method of approval of both houses
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The Mint was created by Congress with the Coinage Act of 1792, and placed within the Department of State. Per the terms of the Coinage Act, the first Mint building was located in Philadelphia, then the U.S. capital. It was the first building of the federation raised under the Constitution.

The Mint's first director was renowned scientist David Rittenhouse. The position is currently held by Edmund C. Moy. Henry Voight was the first Superintendent and Chief Coiner, and is credited with some of the first U.S. coin designs. Another important position at the Mint is that of Chief Engraver, which has been held by such men as Frank Gasparro, William Barber, Charles E. Barber, James B. Longacre, Christian Gobrecht and Anthony C. Paquet, among others.

The Mint was made an independent agency in 1799, and under the Coinage Act of 1873, became part of the Department of the Treasury. It was placed under the auspices of the Treasurer of the United States in 1981.