The generator matrix

 1  1  1  1  1  1  1  1  2
 0  2  0  0  2  2 2a 2a^2+2a  2
 0  0  2  0 2a^2+2 2a^2+2a+2 2a+2  2 2a^2+2a
 0  0  0  2  2 2a^2+2a  2 2a^2 2a^2

generates a code of length 9 over GR(64,4) who´s minimum homogenous weight is 48.

Homogenous weight enumerator: w(x)=1x^0+588x^48+4088x^56+26915x^64+1176x^72

The gray image is a code over GF(8) with n=72, k=5 and d=48.
This code was found by Heurico 1.16 in 0.0278 seconds.