Here are a few points you could include in your letter:

• Local and regional landscape level planning by government, in consultation with local stakeholders, is desperately needed for this New Denver-Kaslo corridor before any applications for development are allowed to proceed.
• This area is a critical wildlife corridor, connecting Valhalla, Goat Range and Kokanee Glacier Parks.  It is core habitat for blue-listed grizzly bear, wolverine, mountain goat, and western toad (a federally listed species-at-risk).  Alpine, subalpine, wetlands, and 39 creeks in the proposed development area make this is a sensitive area in need of conservation.
• As a treasured area important to locals and visitors who recreate, gather food, and hunt, it seems unjust to allow one developer to hold exclusive control over these cherished public lands. The Zincton proposal plans to attract over 1,700 visitors PER DAY to the area – an overwhelming increase in the impact to this land.
• Recreationists continue to get squeezed out by commercial interests. Multiple adventure tourism operators already have tenures in this area, resulting in increasingly limited public access.
• These lands are called Piq kiʔláwnaʔ – the Sinixt word for the rare White Grizzly.  The Autonomous Sinixt strongly oppose this development.  It is unthinkable that in B.C. and Canada today, where reconciliation is of utmost importance, that government would allow a private company to appropriate yet another area of land traditionally used by indigenous people.
• The Zincton proposal will have a negative socio-economic impact on established local communities, as is demonstrated in studies on the effects of resort developments. Increased demand for seasonal real estate creates housing shortages and soaring property taxes, leaving full-time residents out in the cold.
• Tourism is not a saviour. All local surveys and research show that residents want to develop the region through attracting full time residents with innovative approaches that allow for a diverse, ecologically intact, and economically robust community.