FRED - Federal Reserve Economic Data

Producer Price Index by Commodity for Miscellaneous Products: Jewelry, Gold and Platinum 96.6 Index Dec 2011=100 on Dec 2018 97.0,96.9,96.5,96.1,95.3,94.8,94.4,95.3,95.3,96.6
Industrial Production: Mining: Gold ore and silver ore mining 89.4439 Index 2012=100 on Q4 2018 96.2596,101.2390,92.8277,109.0950,96.2304,96.8335,86.4328,86.7761,87.7727,89.4439
Producer Price Index by Industry: Gold Ore Mining: Primary Products 314.7 Index Jun 1985=100 on Dec 2017 303.0,309.0,308.3,312.0,307.0,312.6,325.9,317.9,315.9,314.7
Relative Importance Weight (Contribution to the total industrial production index): Gold ore and silver ore mining 0.1698 % on Dec 2018 0.1780,0.1864,0.1675,0.1611,0.1688,0.1605,0.1596,0.1740,0.1662,0.1698