The generator matrix

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

generates a code of length 60 over Z8 who´s minimum homogenous weight is 58.

Homogenous weight enumerator: w(x)=1x^0+268x^58+56x^60+136x^62+5x^64+44x^66+2x^80

The gray image is a code over GF(2) with n=240, k=9 and d=116.
This code was found by Heurico 1.16 in 42.3 seconds.