Unless you will be travelling some distance by car, these maps will not be a help to you for rockhounding. You might want to make an enlarged photocopy of only the part of the map for your location. Another kind of map is a relief map showing features of the county, province or state, and country. They use shading and highlights to aid you in imagining these features. A mineralogical map indicates the minerals that are common in the area covered by the map.
Different colours represent different minerals.
The Ontario government also has a mineralogical highway map. I think it is free. This is useful for rockhounds. A topographical map is the most useful map for field trips, hiking, camping, and canoeing. These maps give information in great detail.