Looking in a westerly direction this picture taken with 35mm lens shows the Rio Grande River at left, Mud Mountain at top right and Water Tank Hill near the center of image
From the same location as previous image, but zoomed (135mm lens) in on Water Tank Hill where the numerous blackish veins appear as seen in one below image.The red arrow is the approximate area of the black mineral veins, of which one such vein is shown below.
This is an enlarged image of the previous picture.
This image in the approximate location of the red arrow in previous image shows a small portion of the black vein mineralization that harbors thallium, along with considerable manganese and some barite.
This image, in the approximate location of the red arrow illustrated previously is of a small sample of the black vein mineralization and when crushed for tests is completely black, which is likely due to the manganese.
When this mineralization is pulverized, dissolved in concentrated HCl the filtered and dried solution subjected to the high heat of the Vreeland Spectroscope carbon arc produces an intense green line for thallium.
This image is of a portion of the southern side of Water Tank Hill directly above Geronimo Springs Museum and Hot Springs.
These limestone rocks indicate that at one time hot springs emanated from this area, and all these rocks contained varying amounts of thallium