Basically - just throw a decimal in front of ppm to convert to percentage.
1137ppm = 0.1137% = most mining companies usually only report to 2 decimals when grade is < 1% so effectively they are saying 0.11% of cobalt.
So for the copper grade in ppm it's the reverse - 0.54 percent is effectively 5400ppm
ppm to percent conversion:
1% = 1/100
1ppm = 1/1000000
So one part per million is equal to 0.0001 percent:
1ppm = 0.0001%
So to convert from ppm to percent, divide the ppm by 10000:
x(%) = x(ppm) / 10000
Not a math guru - i'm sure someone will correct me if I got something wrong.
