Crepant resolutions of 3-dimensional quotient singularities via Cox rings

We study Cox rings of crepant resolutions of quotient singularities ${\mathbb{C}}^3\mathrm{/}G$ where $G$ is a finite subgroup of $SL(3,\mathbb{C})$. We use them to obtain information on the geometric structure of these resolutions, number of different resolutions and relations between them. In particular, we treat explicitly several examples where $G$ contains elements of age 2.