I think it's great that you're coming on here and looking for honest feedback. When I first started in design, I remember showing stuff to people that I'd been working really hard on and thinking I'd done a really good job only to receive mixed reviews at best. When I look back on the work I was producing, it's now completely understandable why that happened..! No you're not seeing any of it

You get used to it and you begin to work out what works and what doesn't. Eventually you can just 'tell' what's good and what isn't, even if the design is rather alien to you. Just keep on going with it

As for your logo, you say you want to build an identity based on the work you do, but what does a pit wheel or window have to do with your work? If that was presented to me I wouldn't have a clue what the company was about, even with the name underneath it.
As for mining, well I'm as south as you can get and thinking about it, I can't think of a single mining company, any tools used for mining or even the names of any mines! I think this is the first time I've even discussed mining with someone! Maybe I'm an anomaly, but as far as I'm aware mining is definitely not big in the South!
I think you should stick with the current layout you've got and just keep working at it until you've got something that looks good, think of it as a challenge
