The generator matrix

 1  0  0  0  1  1  1  4  1  2  1  2  4  1  1
 0  1  0  0  4  1  5  1  6  1  0  6  1  3  7
 0  0  1  0  5  1  4  5  0  3  5  1  6  6  7
 0  0  0  1  1  4  5  5  3  2  2  3  3  4  3

generates a code of length 15 over Z8 who´s minimum homogenous weight is 12.

Homogenous weight enumerator: w(x)=1x^0+670x^12+1360x^14+1455x^16+560x^18+50x^20

The gray image is a code over GF(2) with n=60, k=12 and d=24.
This code was found by Heurico 1.16 in 9.91 seconds.