| The main yields were lead and zinc ores, in particular galena, blende, cerussite and gossan. |
| Here unusually lustrous crystals to 2.5 cm across occurred in limonite-malachite gossan. |
| It is overlain by up to 7.5 m of gossan and unconsolidated glacial till. |
| This further step forward can be attributed to the presence of iron oxide gossan minerals in the weathered upper zones of copper sulfide deposits. |
| Several Cornish mining words are used in English language mining terminology, such as costean, gossan, gunnies, kibbal, kieve and vug. |
| Most are free of matrix, although some of the paler green or greenish-yellow groups are on gossan and are associated with cream to bluish cerussite. |
