To whom? Your goals serve several important purposes. In terms of engaging people, strategic planning best practices should also emphasize separation from, and integration with, ongoing management accountabilities.
Relevant strategic and operational performance measures and targets, logically derived, are used to monitor progress against targets. After a few years, the new process feels just as uncreative and bureaucratic as the old one.
Divide the plan up among trusted staff, and have them work on sections that make sense based on their responsibilities at your company.
For a sector like mining, a ten-year horizon for the long term could be just right. The degree of competition that you will face and the extent to which you can effectively respond to that competition are important factors in your success.