Yes, elk can be very quiet. While hunting deer in Utah the three of use had fired on a small herd that was traversing the opposite ridge. We had gotten two of them down and proceeded to move down our ridge and up to the "impact area". As we approached the downed deer, a herd of elk jumped up within 20 yards of where the deer had died! They had walked through them to the spot where we shot them. The elk hadn't moved.
...and they can be very noisy. I was riding my dirt motorcycle in Northern Utah, looking for a good spot to hunt deer. I was riding a dirt track along a ridge. My bike isn't especially noisy but with a helmet, you don't hear much else. Suddenly, it sounded like thunder behind me. I looked back to see a herd of elk, cows and calves, cresting the ridge behind me and going down the other side. If I'd been five seconds slower, they'd have run me down!
Get two elk steaks, at least an inch thick, 1¼ to 1½" is better. Remove all fat and connective tissue (silver skin). Marinate in half salad oil and half lime juice seasoned with salt, cracked black pepper, ½ t. white pepper, 1 t. crushed garlic, 2 T. finely chopped onion, ¼ t. ground chili (mild or hot, your choice), ¼ t. oregano. Marinate for at least 6 hours but I like overnight. Grill on a hot grill till medium rare inside. DON'T GRILL IT WELL DONE! If you like a well done steak, use a lower quality cut, you won't know the difference. This recipe works for chicken, lamb, beef, etc.
Bruce