Index No: NBM052050; Collected By: ; Sample Type: hand sample; Notes: Sample from vesicular porous part of Td unit exposed on NNE-trending ledge about 150 feet E and SE of Golden Chariot shaft and dump; much of Td is dense, silicified, with little alunite; good alunite rosettes and clots only found in vesicles and pumiceous, porous parts of unit. (Sample dated, alunite, 18.0 +/- 0.5)