are otherwise less adequately spaced ore.form.

[Alex16]

• “Proven (measured) reserves” are defined as reserves for which (a) quantity is computed from dimensions revealed in outcrops, trenches, workings or drill holes; grade and/or quality are computed from the results of detailed sampling; and (b) the sites for inspection, sampling and measurement are spaced so closely and the geologic character is so well defined that size, shape, depth and mineral content of reserves are well-established.
• “Probable (indicated) reserves” are defined as reserves for which quantity and grade and/or quality are computed from information similar to that used for proven (measured) reserves, but the sites for inspection, sampling, and measurement are farther apart or are otherwise less adequately spaced.

are farther apart - на большем удалении друг от друга

are otherwise less adequately spaced - или на удалении, которое является менее приемлемым?

[itisasecret]

are farther apart or are otherwise less adequately spaced - расположены по более редкой либо недостаточной сети.