Anandakanda 1.9.174

1.9.174

tayoḥ samaṃ mṛtaṃ hema varākvāthena mardayet /
tatsarvaṃ saṃpuṭe kṣiptvā bhūdharākhye puṭe pacet //

and killed gold equal to the two together. One should grind [them] with a decoction of triphalā, / place all that in an earthen container, and cook it in the pit called bhūdhara.