I'd like to modify this chart to relocate the z axis label so it's not over printing the values.
data = RandomReal[{0, 100}, {100, 2}]; Histogram3D[data, 20, "ProbabilityDensity", AxesLabel -> {Style["Mean Rate (tph)", "Text"], Style["Duration (minutes)", "Text"], Style["Probability Density", "Text"]}, ImageSize -> Large, PlotLabel -> Style["Concentrator Run Duration and Mean Rate", 18], ChartStyle -> TSGblue, ViewPoint -> {Pi, Pi, 2}] 
I can rotate the label but the values are still over printed.




AxesLabel -> {Style["Mean Rate (tph)", "Text", Background -> White], Style["Duration (minutes)", "Text", Background -> White], Style["Probability Density", "Text", Background -> White ]}$\endgroup$Ticks-> {Automatic,Automatic,{0,.0005,.0010}}$\endgroup$