Taken from a couple of publications on-line re definition of bonanza grades:

RIN (Resource Investment News): Can you explain concentration of ore? For instance, is 237.6 g/t from a hole a good concentration of gold? What about 2.1 g/t?

CE: That is a bonanza grade. The higher the concentration, the higher the grade, the richer the deposit is. But you have to take into account intercepts and depths of the concentration.

From Puddle Pond Resources report:

...bonanza grades for gold at 34.89 g/t (1.12 oz/t) and silver from 200 g/t to 574 g/t (6.43 oz/t to 18.46 oz/t).

Ike