| Deeper down in the earth comes the unoxidized zone which continues indefinitely. |
| An enormous amount of mineralization remained, but it consisted only of deep, unoxidized sulfides so low in grade that mining them was not economical. |
| It is only the unoxidized pale greenish stuff that can act as the dye, the dark brown itself has no affinity for the wool. |
| In calculating the available energy, correction is made for the unoxidized residue, as urea and allied forms. |
| None of these features was seen on our unoxidized Belgian specimens. |
| This was partially due to a lack of technology to concentrate the deeper unoxidized ores and the high cost of transportation to the nearest railhead. |
