How do we distinguish the heart and mind?

From Ramabhadra Priya Prabhu

The following statements from various speakers have invoked an inquiry, kindly answer.

“Singing the bhajans of Narottam Das Thakur causes the mind to reflect on the mood of pure devotion, and the heart to  feel intense separation from Radha and krishna”

H H Mahanidhi Swami

“  Mechanical chanting means we are in our mind, not in our heart.

• ·         When we go to our heart, we get out of our mind.
• ·         When we dwell in our mind (our thoughts of ourselves and our lives) the heart closes.”

H G Mahatma Prabhu.

Q 1 My question is how do we distinguish the heart and mind, what is the difference between the two, what are the distinguishing characteristics, functions, symptoms between the two?

Q2 Srila Prabhupada writes “the soul in located in the region of the heart” ( you find ref’s for the same BG 15.15, BG18.61 éçvaraù—the Supreme Lord; sarva-bhütänäm—of all living entities; håt-deçe—in the location of the heart;) , my question is where is the location of the Mind , are there any references for the same?( In Bg 7.4 only the the 8 elements that constitute the material energy is explained).