Build charcoal fire for indirect cooking by situating coals on one side of grill, leaving other side empty. Heat grill to 250 degrees.
To make dry rub: In small bowl, combine salt, brown sugar, chili powder, coffee, cocoa, black pepper, garlic powder, onion powder, ancho chile pepper, coriander and turmeric.
Generously apply dry rub onto front and back of pork ribs. Gently pat to ensure the rub adheres. Put ribs meat-side up over indirect heat, away from coals, close lid and cook until ribs are tender, about 3-1/2 hours.
Remove ribs from grill and let rest, uncovered, 5 minutes. Slice ribs between bones and serve.