Historical information

Assay is a process of metallurgy and chemical analysis used to determine proportions of precious metals in ores and other metallurgy substances such as silver or gold. The process helps identify pollutants present within a sample and can indicate a high level of pollution in a mining site. Stoneware crucibles are used in the fire assay process due to their ability to withstand high temperatures. Fire assay is a three step process where by samples from the mine are ground in a find powder and then mixed with dry powder chemicals. This mixture is heated in a crucible to extreme temperatures (crucible fusion) until all of the powers fuse into a glass like slag. Once this reaction is complete, the contents are poured into a mold and cooled. In step three (known as cupellation) the mixture is separated in a fire assay cupel and once this is complete the cupel with reveal a small bead of precious metals.

Physical description

Two stoneware vessels of differing dimensions (0287.1 & .2).
Unglazed and porous, showing extensive signs of use. Stamped and marked on the outside. 0287.2 has a shaped pouring lip.
Six smaller items, coins, buttons (0287.3,.4,.5,.6,.7,.8) were found with the crucibles but their relationship to the assay items is unknown.

Inscriptions & markings

0287.1; Large crucible; Bendigo Pottery / E.
0287.2; Small crucible: Pottery / C I