There are a few tools out there that will give you your exact solar insolation hours for your area. I'll post a few links at the bottom of the post. When i designed systems at Affordable Solar Group here in Albuquerque, i would design the systems over the phone so i would use the customer/businesses zip code and basic roof information (really just the pitch of the roof or if it is a flat roof) and the following website:

http://pvwatts.nrel.gov/

I haven't designed a system in a few years but the physics and principles don't change, just the products. To design a full system, all that is needed after figuring out the insolation hours for your spot is how much energy per day on average you want the system to cover. Since solar can last 25+ years (solar panel warrantees and inverters have 25 year warrantees), i would add aging factors to the equation to get a system that should produce well for 20 years at least (prob not needed for mining though honestly).

Sorry for the long reply, but here are devices that do what the website i sent you do to your exact site instead of the average of the zip code used. The first one i list is one that i used when i taught PV (photovotaic) system design classes at the local community college. Honestly, the website gives a solid number that can be adjusted to fit the locality better and i am always happy to help with anything like this since i have 7 years of PV design experience:

http://www.solarpanelstore.com/solar-power/tools/meters/daystar_ds_05_solar_meter.html?_vsrefdom=adwords&gclid=CMaOy8vb8NQCFRW4wAodGEMP2w

https://www.solarmeter.com/model100.html?utm_source=google&utm_medium=cpc&utm_content=10.0PVSunLight&gclid=CI3pi9nb8NQCFU-2wAodtk0IVg

https://www.grainger.com/product/39N145&AL!2966!3!50916779277!!!g!81031937157!?gclid=CJDl4eLb8NQCFQOBaQodSTIN5w&cm_mmc=PPC:+Google+PLA?campaignid=175664997&s_kwcid=AL!2966!3!50916779277!!!!81031937157!&ef_id=WVkGBwAAAICYOwPA:20170704225219:s