Grand Forks business partners to use cargo container to mine cryptocurrency Zach Keenan and local businessman Aaron Hall have founded Sundog Mining, via which they plan to “mine” cryptocurrency, the virtual coins that are an increasingly popular investment among tech-minded people. 7:00 am, Apr. 11, 2021 × Aaron Hall, left, and Zach Keenen, co-founders of Sundog Mining LLC, will start a cryptocurrency mining business in Grand Forks. The data processing center will be located inside a cargo container at a Minnkota Power substation. Photo by Eric Hylden/Grand Forks Herald For Zach Keenan, mining cryptocurrency started as a way to earn enough money to keep buying video games. Now he’s turned it into a full-time business.