Fig. 6. Estimated recharge percentage as a function of average heap height. Recharge percentage represents the best estimate of long-term steady-state drainage as a percentage of annual precipitation. Bubble size is 1/N, with N being the number of data points used to calculate recharge percentage. Large bubbles represent fewer data points. The correlation is not definitive, but the data suggest that higher heaps may be more likely to have higher recharge rates.