The Supreme Lord can be compared to a gold mine, and the cosmic creations can be compared to ornaments made from that gold

Expressions researched:
"gold mine"

BG Chapters 13 - 18

BG 14.26, Purport:

To be in Kṛṣṇa consciousness or in devotional service means to acquire equality with Kṛṣṇa. The Lord says that His nature is eternal, blissful and full of knowledge, and the living entities are part and parcel of the Supreme, as gold particles are part of a gold mine. Thus the living entity, in his spiritual position, is as good as gold, as good as Kṛṣṇa in quality.

SB Canto 8

SB 8.3 Summary:

Indeed, all living entities are parts of Him, for He is the origin of Mahā-Viṣṇu, who is the source of the living entities within this material world. The Lord can observe the activities of our senses, which can work and achieve material results because of His mercy. Although He is the original source of everything, He is untouched by any of His by-products. In this way He is like a gold mine, which is the source of gold in ornaments and yet is different from the ornaments themselves.

SB 8.12.8, Purport:

There is oneness because everything emanates from the Supreme Brahman. The example already given is that there is no difference between a golden earring and the gold mine as it is. The Vaiśeṣika philosophers, however, because of their Māyāvāda conception, create differences. They say, brahma satyaṁ jagan mithyā: "The Absolute Truth is real, and the cosmic manifestation is false." But why should the jagat be considered mithyā? The jagat is an emanation from Brahman. Therefore the jagat is also truth.

CC Madhya-lila

CC Madhya 23.77, Purport:

The qualities of Kṛṣṇa are present in the living entity in minute, atomic quantities. A small portion of gold is certainly gold, but it cannot be equal to a gold mine. Similarly, the living entities have all the characteristics of the Supreme Personality of Godhead in minute quantity, but the living entity is never equal to the Supreme Personality of Godhead. God is therefore described as the Supreme Being, and the living entity is described as a jīva. God is described as the Supreme Being, the chief of all living beings, because He is supplying the necessities of all others—eko bahūnāṁ yo vidadhāti kāmān. The Māyāvādīs maintain that everyone is God, but even if this philosophy is accepted, no one can maintain that everyone is equal to the Supreme Godhead in every respect. Only unintelligent men maintain that everyone is equal to God or that everyone is God.

Teachings of Lord Caitanya

Teachings of Lord Caitanya, Chapter 23:

A chemist can manufacture water in the laboratory by mixing hydrogen and oxygen, but in reality the living entity can only work under the direction of the Supreme Lord. Indeed, all materials used by a chemist are supplied by the Lord. The Lord knows everything directly and indirectly, and He is cognizant of all the minute details of everything. He is fully independent as well. He can be compared to a gold mine, and the cosmic creations can be compared to ornaments made from that gold, such as gold rings, necklaces, etc. The gold ring and necklace are qualitatively one with the gold in the mine, but quantitatively the gold in the mine and the gold in the earring or necklace are different. Lord Caitanya's philosophy of the Absolute Truth centers about the fact that the Supreme Lord is simultaneously one with and different from His creation. Nothing is absolutely equal to the Absolute Truth, but at the same time nothing is independent of it.

Bhagavad-gita As It Is Lectures

Lecture on BG 2.12 -- Hyderabad, November 17, 1972:

Similarly, the soul and the Supreme Lord, equal in quality. Kṛṣṇa says, mamaivāṁśa. The small particle of gold is gold. That is advaita. You cannot say, because it is small particle of gold, you cannot say, "It is iron." It is gold. That is advaita. But the gold mine and the gold earring, there is difference. You cannot say the gold earring is as good as the gold mine. That is dvaita. so in this way, as so far our spiritual existence is concerned, we are one. But so far our energies are concerned, that is different. That is dvaita-advaita. You have no such big energy as God has. In that sense you are different.

Lecture on BG 2.12 -- London, August 18, 1973:

In the Kaṭha Upaniṣad there is the verse nityo nityānām. Nityo nityānām. Nityānām means ever existing. Nitya means ever, always. So either Kṛṣṇa or we, every one of us are ever-existing, because we are part and parcel of Kṛṣṇa. Therefore, if Kṛṣṇa is ever-existing, so we are also ever-existing. A particle of gold is gold, qualitatively. The value of gold mine and the gold earring may be different. Gold earring may be, say, hundred dollars, but a gold mine, millions of dollars. But both of them are gold, not that it is iron. Therefore, less value, no.

Lecture on BG 2.13 -- Hyderabad, November 18, 1972:

Indian: Paramātmā is entirely different from the ātmā and...

Prabhupāda: That I will explain. In quality, you are one. Because a particle of gold is also gold. But the gold mine is not equal to the gold earring. That is mistake.

Indian: They say ātmā is the Paramātmā.

Various Indians: Not, not, the... Not the whole.

Prabhupāda: Not the... One is great. Another is small. That is the difference. Quality is the same.

Indian: That means Paramātmā and the ātmā...

Prabhupāda: Quality same.

Indian: Quality same

Prabhupāda: Quantity different.