Note 10 — Expedition to the Mines of the Igorrotes

Smelting. 23. Monday, the twentieth of the said month, another assay was made by fusing one quintal of litharge10 and two of ore obtained from the said hole and vein preceding. From the said mixture, although they tried it several times, it was impossible to fuse or melt the said ore. On the contrary, there was a loss of the lead consumed with the said litharge, and the mixture continued to be consumed; so that having been exhausted and the oven having become clogged, it was necessary to stop without succeeding with the said assay. They attributed that to the said ore being unfit for smelting.