The 2006-S South Dakota Silver Quarter is worth anywhere from $8 in typical proof condition to over $100 for high-grade Deep Cameo specimens. While these coins were never intended for circulation, many people find them in inherited collections or “proof sets” and wonder if they have struck silver gold.

Condition / Grade	Estimated Market Value
PR 65 (Standard Silver Proof)	$8 – $12
PR 69 Deep Cameo	$15 – $25
PR 70 Deep Cameo (Perfect)	$80 – $150+

Identifying Your 2006-S South Dakota Silver States Quarter

If you have found a shiny 2006 quarter featuring Mount Rushmore and a Chinese Ring-necked Pheasant, you might be holding a piece of history. However, not all 2006-S quarters are created equal. The San Francisco Mint produced two versions: a base-metal copper-nickel clad version and a specimen made of 90% silver. If you aren’t sure which one you have, using a top coin identifier app like CoinKnow can help you distinguish between the two by analyzing the coin’s luster and edge.

The South Dakota quarter was the 40th coin released in the 50 State Quarters Program. The reverse design, created by John Mercanti, depicts the iconic Mount Rushmore alongside the state bird and stalks of wheat. Identifying the “S” mint mark is the first step, as this indicates it was struck in San Francisco. If the edge of the coin is solid silver (rather than showing a copper stripe), you have the more valuable silver variant.

Professional collectors rely on tools like the CoinKnow app to verify these details instantly. Because these coins were sold in special “Silver Proof Sets,” they usually remain in excellent condition. However, if a coin is removed from its protective plastic case, it can quickly develop scratches or “hairlines” that significantly lower its resale value.

Understanding the Silver Content and Melt Value

One reason the 2006-S South Dakota Silver States Quarter Dollar value is higher than a standard quarter is its precious metal content. These coins are composed of 90% silver and 10% copper. Each coin weighs exactly 6.25 grams, meaning it contains approximately 0.1808 troy ounces of pure silver. This gives the coin an intrinsic “melt value” that fluctuates day by day based on the global silver market.

Even if the coin is scratched or damaged, it will never be worth less than its weight in silver. For many investors, these quarters represent a “junk silver” stacking opportunity where the face value of 25 cents is irrelevant compared to the metal. However, for the average person who finds one, the numismatic (collector) value is usually slightly higher than the melt price.

Composition Detail	Measurement
Silver Purity	90% Silver (.900 Fine)
Total Weight	6.25 Grams
Diameter	24.3 mm

Grading and the Impact of “Deep Cameo” Finish

When evaluating the 2006-S silver quarter market value, the term “Deep Cameo” (DCAM) is vital. The San Francisco Mint uses a special process where the raised parts of the design (like the faces of the presidents on Mount Rushmore) appear frosted, while the flat fields look like mirrors. This creates a stunning black-and-white contrast.

The most common grades for these coins are PR 68 and PR 69. A grade of PR 70 represents a “perfect” coin with no visible flaws under 5x magnification. While a PR 69 might sell for $15, a PR 70 can fetch a significant premium because collectors of the State Quarter series strive for a “perfect set.” If you are managing a collection, CoinKnow can help you keep track of these specific grades and their current auction trends.

Even tiny imperfections can change a coin’s price. A fingerprint on a silver proof coin can permanently damage the surface through acidic oils, which is why collectors always handle them by the edges or with gloves. If your South Dakota silver quarter came from a broken-up set and has been handled, it will likely be valued at the lower end of the spectrum.

Comparative Pricing: South Dakota vs. Other 2006 Quarters

The year 2006 was busy for the U.S. Mint, releasing five different state designs: Nevada, Nebraska, Colorado, North Dakota, and South Dakota. In terms of rarity, the silver proof versions of these coins had similar mintage numbers, usually around 1.1 to 1.6 million units. Compared to the hundreds of millions of circulation quarters minted in Philadelphia or Denver, these are relatively scarce.

For example, when looking at the 2006 Nevada quarter auction data, you will notice that even standard business strikes can sometimes be valuable in high MS grades. However, the South Dakota Silver Proof generally maintains a higher baseline price because of its silver content and “Proof” status. Unlike “Business Strike” coins meant for vending machines, these were never meant to spend.

2006 State Strike	Mintage Type	Typical Value
South Dakota (S)	90% Silver Proof	$10 – $25
South Dakota (S)	Clad Proof	$1 – $3
South Dakota (P or D)	Circulation Clad	$0.25

Are There Any Rare Varieties or Errors to Look For?

While the 50 State Quarters series is famous for errors like the “Extra Leaf” Wisconsin quarter, the 2006-S South Dakota silver proofs are generally very high quality. Because they are inspected at the mint before being placed in sets, major errors are extremely rare. However, collectors still look for minor “strike through” errors where a piece of dust or thread got between the die and the coin.

Another thing to look for is “Toning.” Silver reacts to its environment over time. Some silver proof quarters develop beautiful iridescent colors like blue, gold, or purple. This natural oxidation is called toning. A 2006-S South Dakota Silver Quarter with “monster toning” can sell for a much higher price than a standard white silver coin, simply because of its unique eye appeal.

If you suspect you have an error or a uniquely toned coin, taking a photo and uploading it to CoinKnow can provide a quick reference to similar coins sold at auction. Often, what looks like a scratch to a novice might actually be a rare minting flaw called a “die crack,” though these are very uncommon on proof strikes.

How to Sell Your 2006-S Silver South Dakota Quarter

If you’ve decided to part with your coin, you have several options. Because the individual value is relatively low (around $10-$15 for a common proof), selling a single coin on eBay might result in high shipping fees that eat into your profit. It is often better to sell these as part of a complete 2006 Silver Proof set or to a local coin shop in a batch.

Local coin dealers will typically offer you “wholesale” prices, which might be close to the silver melt value. If you want the maximum price, you’ll need to list it on a platform where collectors browse. Ensure you provide clear, high-resolution photos of both the front (obverse) and back (reverse). Mention the “S” mint mark and the silver edge clearly in your description to attract the right buyers.

Keep in mind that if the coin is already professionally graded by NGC or PCGS, it will sell faster and for more money. Grade 70 coins should always be sold through reputable auction houses or specialized eBay listings. For raw, uncertified coins, your best bet is to use the CoinKnow app to verify its likely condition before talking to a dealer.

FAQ

Q: How can I tell if my 2006-S quarter is silver or clad?

A: Check the edge of the coin. A silver quarter will have a solid silver-colored edge. A clad quarter will show a visible reddish-brown copper stripe. Additionally, the silver version weighs 6.25g, while the clad version weighs 5.67g.

Q: Was the South Dakota silver quarter ever released into circulation?

A: No. Silver proof quarters were only sold by the U.S. Mint in special collections. However, sometimes people spend them by mistake, so it is possible (though very rare) to find one in your pocket change.

Q: What is the silver value of this coin today?

A: The melt value of a 90% silver quarter is tied to the spot price of silver. Usually, it is worth between $4 and $6 based on the metal alone, but it carries a higher collector value if it is in good condition.

Q: Is Mount Rushmore on the back of all 2006 quarters?

A: No, only the South Dakota quarters. In 2006, the mint also released quarters for Nevada (Mustangs), Nebraska (Chimney Rock), Colorado (Longs Peak), and North Dakota (Bison).