As you may know, there are a significant number of traders who are convinced that the price is being manipulated by a gold Cartel (see www.gata.org). This Cartel is thought to be led by the US Treasury and US Federal reserve and its purpose is claimed to be holding the price of gold down to make the US economy look bad. The action in the gold market that I watch is evidence enough for me to treat this theory as a working hyposthesis.
Here's one trading setup that these traders claim to see. Wait until about 5 minutes before the close and look for:
(1) Golding mining stocks are down AND
(2) Price of gold is up AND
(3) General market is doing better than gold mining stocks AND
(4) Possible negative news for the US dollar or economy due tomorrow.
From my watching things for a few months, I'd say this happens between once and twice a month, but I haven't formally back-tested it. For this week, Wednesday was the day (see chart below):
(1) Gold mining stocks were down around 3% as measured by the GDX ETF.
(2) Price of gold was up around 1/2% as measured by the GLD ETF.
(3) The general market was down around 1.7% as measured by the SPY ETF, better than the GDX.
(4) The possible negative news was the EU interest rate decision and the non-farms payroll employment numbers.

Per the theory, the price of gold opened around 1% lower the next morning (GLD) and gold mining stocks (GDX), at their low early that morning were down around 3 1/2%. My watching the price of gold closely since last November indicates that, at least from recollection, this is a tradeable pattern. I expect I may attempt to start trading it, going forward.
So, what vehicles are there for trading this using an ordinary stock market account? One could use gold futures, but that seems to open a whole new can of worms for the investor. The table that follows lists some ETFs that might be used for this.
Liquidity is critical when looking at a short-term trading vehicle. I want to be able to get in and out without significantly affecting the price. I'd like my price impact to be under .1%. When I'm experimenting, my trades are under 50K$. When I'm serious I aim for a trade size between 100K$ and 200K$. The way I measure liquidity is the vehicle's daily dollar volume, that is, the number of shares traded times the share price. For trading, I like my trades to be under 1% of the daily volume. Of course, the more liquid, the better. So, for a trading vehicle, I'm looking for something with a daily dollar volume of at least 10 million $. From the above table, GLD, SLV and GDX are clearly plenty liquid. DGL and DGZ are clearly not liquid enough. The rest are marginally liquid.
Sticking with the actual metal ETFs, here's a look at the performance of the various choices:
GLD (single-long gold) is extravagantly liquid, but, being unleveraged, provides only a 1% gain from the overnight trade. It would be nice to get more of a pop from this kind of trade. I would have to go short for this particular trade, which I don't like to do because of the possibility of unlimited loss. This is a real possibility with gold. Imagine a terrorist attack or some other Black Swan event where the markets are closed for days or weeks while the price of gold sky rockets. The loss with a short position could be unlimited. I don't want to have a Black Swan event cause me to "blow up" (see The Black Swan or Fooled By Randomness by Nassim Taleb).
SLV (single-long silver) is also extravagantly liquid and provides around a 1.75% gain from the overnight trade. SLV tracks silver which typcally tracks gold reasonably closely with more volatility, so it seems like a possible trading vehicle. I would have to go short for this particular trade, which I don't like because of the possibility of unlimited loss.
DGP (double-long gold) is marginally liquid and provides around a 2.5% gain from the overnight trade. Again, I would have to go short.
DGZ (double-short gold) is less marginally liquid and provides around a 2.5% gain where you don't have to go short. In the absolute worst-case, with this vehicle the most I can lose is the amount invested. If I attempt this kind of trade in the future, this is my preferred metal ETF.
CEF (single-long gold and silver) is marginally liquid and doesn't seem to provide any particular advantages over GLD for this kind of trade.
Moving to the miner ETFs, here's a look at the choices:
Apart from the holidays (July 1 for Canadian ETFs, early close July 3 for American), the first thing that hits one is that the HGU.TO and HGD.TO ETFs are the most volatile of any of the vehicles discussed. The second thing to notice is that it took a while after the opening for all of the miner's to adjust to the step-function change in gold price. This has two implications:
(1) Its harder to judge the exit point from such an overnight trade.
(2) It may be possible to do an arbitrage day-trade where one enters at or near the open rather than risking the overnight trade. This depends a lot on the liquidity / stability of the vehicles and is for further study.
So, here's an overview of how each miner ETF would have worked if you could get out near the optimum point early on Friday:
HGD.TO (double-short gold miners) - could have yielded approximately 5.5% with marginal at best liquidity. This is my overall preferred vehicle for this kind of trade should I make it in the future, although the limited liquidity is an issue.
HGU.TO (double-long gold miners) - could have yielded an approximately 5.5%, with almost decent liquidity, butone would have to enter short.
GDX (single-long gold miners) - could have yielded 3.5% with excellent liquidity, but one would have to go short.
Of course, actually trading gold futures is another option that probably would have even better leverage with quite good liquidity. This is for future study.
Let me know what you think about this, whether you have successfully short term traded gold and what vehicles and setups you like.
Monty
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