In a large saucepan, saute the onion, celery, mushrooms, garlic, thyme, chives, poultry seasoning, salt and pepper in the olive oil until the vegetables are soft.
Stir in the raw wild rice and the 2 cups chicken broth and butter pat; bring to a boil, then reduce heat and simmer on low for 40 minutes.
Lift the lid and quickly add the raw long grain rice, the 3/4 cup chicken broth and salt.
Replace lid and simmer on low for another 20 minutes.
Remove from heat and place a large clean dish towel between the top of the pan and the lid, and let sit for 15 minutes or so, then remove and fluff rice with fork.