The generator matrix

 1  0  1  1  1  1  1  1  0
 0  1  1  a 3a^2+2 2a^2+3a+1 a^2+3a  a  1
 0  0 2a^2+2  0  2  2 2a^2+2 2a+2 2a^2+2a
 0  0  0  2 2a^2+2 2a 2a 2a^2+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+896x^49+18424x^56+12544x^57+57344x^63+127267x^64+43904x^65+1176x^72

The gray image is a code over GF(8) with n=72, k=6 and d=48.
This code was found by Heurico 1.16 in 0.623 seconds.