I'm sure you will get many submissions that directly relate the "sand-gravel" part of your name. By your company description, you handle all types of excavation / digging terrains and issues. I have attempted to visually communicate this greater scope of your identity. The design breaking into the "M" is intended to convey the idea of surface depth / excavation layers. The center point of the "M" pointing downward then visual communicates the downward notion of digging into these layers.
I have worked with many company's on re-brand / brand reposition projects. At the point of such an identity shift, greater awareness of the business can be achieved thru broader sweeps of change ... such as expanding the brand color palette, while retaining the core brand color somewhere in the logo mark. This can also convey an sense of "growth" of the biz in some way (either through size, capabilities or strength) as well as "relevance" (current technology, best standards, etc).
If you would consider for a second, this logo concept is communicated much more effectively with the addition of tones that better convey a cross-section of an excavation (green / brown). There can still be a 1 color version of the logo for production needs that are limited to one color.
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