This is a 2010 US dollar coin, with no gold content, just as 'silver' dollars have no silver content; the colloquial name is for the color.
More info:
Mass 8.100 g (0.26 troy oz) Diameter 26.5 mm (1.043 in) Thickness 2.00 mm (0.0787 in) Edge Engraved: text "E pluribus unum", the coin's mint mark, its year of issuance, and 13 five-pointed stars (prior to 2009: text "In God We Trust") Composition Copper with manganese brass cladding: 88.5% Cu 6% Zn 3.5% Mn 2% Ni