Need to order by title then slug

I am trying to workout how to orderby title then a slug but having no luck. The code below works but I need to change the meta_key to a taxonomy. Any ideas? This on a local build not online yet as I am testing the code.

$argsnf = array(
		'post_type' => 'mining-company',
		'post_status'        => 'publish',
		$taxmw  => $slugmw,
		 'meta_key' => 'bw-mining_state', // Name of meta key
		 'orderby' => 'title meta_value', // Order by number of meta value
		 'order' => 'ASC', // Order by lowest to highest value (1,2,3,4,..)		'tax_query' => array(
        array(
        'taxonomy' => 'mw-buss_type',
        'field' => 'id',
        'terms' => 189,
        'operator' => 'NOT IN'
        )
    )

	);
	$the_query = new WP_Query( $argsnf );