It's about 0.0000004 times as heavy as The Sears Tower
In other words, 3,000 ounces is 0.00000042140 times the weight of The Sears Tower, and the weight of The Sears Tower is 2,373,000 times that amount.(officially "Willis Tower" as of 2009) (Chicago, Illinois)
The Willis Tower weighs approximately 7,118,000,000 ounces. The outer wall surface of the Tower is covered with black anodized aluminum panels which would total 110,000 sq. m (28 acres) if laid out together.
It's about 0.0000003 times as heavy as The Empire State Building
In other words, 3,000 ounces is 0.0000002570 times the weight of The Empire State Building, and the weight of The Empire State Building is 3,890,000 times that amount.(New York City, New York)
The Empire State Building weighs approximately 11,700,000,000 ounces. About 4% of the building's weight is its 6,000 cu. m (200,000 cu. ft) of limestone façade.
It's about 4,000,000 times as heavy as a Grain of Rice
In other words, the weight of a Grain of Rice is 0.000000250 times 3,000 ounces.(conventional; US; long-, medium-, and short-gran varieties; uncooked)
With great differences in variety, the average among a sampling of common short-, medium- and long-grain rices finds that a single grain weighs about 0.00074 ounces before cooking. A staple through most of human history, archaeological evidence indicates that the earliest rice cultivation was about 11,500 years ago.
It's about 0.0000001 times as heavy as The Golden Gate Bridge
In other words, 3,000 ounces is 0.0000001060 times the weight of The Golden Gate Bridge, and the weight of The Golden Gate Bridge is 9,430,000 times that amount.(San Francisco, California and Marin County, California) (Post 1986 weight reduction; total weight of bridge, anchorage, and approaches)
Following the completion of the 1986 project to eliminate excess material, the total weight of the Golden Gate Bridge — including its anchorages and approaches — is 28,400,000,000 ounces. The two main cables in the spanning the bridge are spun out of a total of 129,000 km (80,200 mi) of wire.
It's about 20,000,000 times as heavy as a Grain of Sand
In other words, 3,000 ounces is 19,000,000 times the weight of a Grain of Sand, and the weight of a Grain of Sand is 0.0000000530 times that amount.(medium grain)
With tremendous variety in the size of grain and the component material, grains of sand weigh an average of 0.00016 ounces. In 2007, a team of seven in Myrtle Beach created the world's tallest sandcastle, which measured 15.10 m (49.55 ft) in height.
It's about 25,000,000 times as heavy as a Sesame Seed
In other words, 3,000 ounces is 23,400,000 times the weight of a Sesame Seed, and the weight of a Sesame Seed is 0.00000004270 times that amount.(Sesamum indicum)
A sesame seed weighs approximately 0.000128 ounces. The McDonald's Big Mac sandwich, which is well-known for its sesame seed top bun, accounts for the consumption of an estimated 70,900 ounces of sesame seeds each day.
It's about 0.00000002 times as heavy as The Great Pyramid of Giza
In other words, 3,000 ounces is 0.0000000140 times the weight of The Great Pyramid of Giza, and the weight of The Great Pyramid of Giza is 71,000,000 times that amount.(a.k.a. Pyramid of Khufu, a.k.a. Pyramid of Cheops) (Cairo, Egypt)
The Great Pyramid of Giza has an estimated mass of 210,000,000,000 ounces. The 2,300,000 stones used in the construction of the pyramid weighed an average 80,000 ounces and were quarried from distances of up to 805 km (500 mi) away.