kmines: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/kmines - from package: kdegames

You may install the required package with command yum install {package}
Error in other languages:
kmines: bevel nie gevind nie
kmines: comandă negăsită
kmines: comando não encontrado
kmines: commande introuvable
kmines: command not found
kmines: käsku ei ole
kmines: không tìm thấy lệnh
kmines: komanda nerasta
kmines: Kommando nicht gefunden.
kmines: kommandot finns inte
kmines: komut yok
kmines: nie znaleziono polecenia
kmines: níor aimsíodh an t-ordú
kmines: no se encontró la orden
kmines: no s'ha trobat l'ordre
kmines: opdracht niet gevonden
kmines: parancs nem található
kmines: perintah tidak ditemukan
kmines: príkaz nenájdený
kmines: příkaz nenalezen
kmines: команда не найдена
kmines: командата не е открита
kmines: 命令找不到
kmines: コマンドが見つかりません